Yes. It was explained, but I will state it even more plainly so there is no room for confusion.
The question itself is built on a false assumption. Scripture never says Satan must be bound in the Revelation 20 sense before Gentiles can be saved.
This is true, but what Scripture does say is that Satan deceived nations (Gentiles) before being bound. That meant that only few from among the nations (Gentiles) prior to his binding were being saved. Since the cross and resurrection that truth changed decisively. Because now, since the advent of Christ the nations (Gentile) are hearing the gospel of the Kingdom of God preached and innumerable multitudes of Gentiles (nations) have been and are being saved. That's a FACT that cannot be denied!
Revelation 20 does not say Satan is bound so that no Gentile can ever be saved before that event. It says he is bound “that he should deceive the nations no more” ~Revelation 20:3. That is a global condition, not individual conversion.
Multitudes of Gentiles as well as Jews do indeed remain in blindness and unbelief. But the remnant of Jews of Old with innumerable multitudes (Gentiles) globally are also being saved. In FACT, whosoever is ordained to eternal life whether Jew or Gentile are NOW, since the advent of Christ turning to Him in repentance eternally saved. That was not happening before the cross and resurrection bound the power Satan had to hold the nations in fear of death. It's only after the cross and resurrection that this began to come to pass in great numbers as never before had been. That's how we know the victory of Christ's cross and resurrection bound Satan's power, keeping him from taking away the word sown in the hearts of all who have been ordained to eternal life from the foundation of the world.
Mt 13:19 When any one heareth the word of the kingdom, and understandeth it not, then cometh the wicked one, and catcheth away that which was sown in his heart. This is he which received seed by the way side.
The Word of God was not preached to the nations (Gentiles) that they too might hear with their hearts, repent of their sins and turn to Christ for salvation. Because preaching the gospel of the Kingdom of God was not sent unto every nation until AFTER the cross and resurrection of Christ.
Romans 10:8-9 (KJV) But what saith it?
The word is nigh thee, even in thy mouth, and in thy heart: that is, the word of faith, which we preach; That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
Hebrews 4:12 (KJV) For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow, and is a discerner of the thoughts and intents of the heart.
Acts 13:46-48 (KJV) Then Paul and Barnabas waxed bold, and said, It was necessary that the word of God should first have been spoken to you: but seeing ye put it from you, and judge yourselves unworthy of everlasting life, lo, we turn to the Gentiles. For so hath the Lord commanded us, saying, I have set thee to be a light of the Gentiles, that thou shouldest be for salvation unto the ends of the earth. And when the Gentiles heard this, they were glad, and glorified the word of the Lord: and as many as were ordained to eternal life believed.
Christ builds His church now not because Satan is already bound from deceiving the nations, but because Christ has all authority. “All power is given unto me in heaven and in earth” ~Matthew 28:18. Authority to save does not require Satan to be restrained globally.
This is also true. But what you do not acknowledge is how the gospel of the Kingdom of God was NOT sent unto the nations (Gentiles) that they too might be saved, until AFTER the advent of the cross and resurrection. How could Gentiles believe before hearing the Word (gospel of the Kingdom of God) proclaimed? Faith comes by hearing and hearing by the Word of God. Until Christ sent out His disciples unto all the nations of the world, the nations (Gentiles) being without the Word of life mostly remained in darkness and unbelief.
Romans 10:13-15 (KJV) For
whosoever shall call upon the name of the Lord shall be saved. How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher? And how shall they preach, except they be sent? as it is written, How beautiful are the feet of them that preach the gospel of peace, and bring glad tidings of good things!
If Satan were already bound so that he deceives the nations no more, then Revelation 20:7–8 would make no sense when Satan is released and again deceives the nations. That would describe the same condition we already have, which empties the passage of meaning.
It makes perfect sense when you understand that Satan shall not be set free before the gospel of the Kingdom of God has been proclaimed unto all the nations of the earth that the Kingdom of God in heaven will be complete. When time given the church to preach the gospel of the Kingdom of God, symbolically a thousand years, has expired than and only then will Satan be loosed once again. The purpose for him being set free is so he can gather together all who remain in darkness and unbelief during his little season (Gog & Magog), to be burned up by the fiery wrath of God that shall come down from heaven.
Revelation 20:3 (KJV) And cast him into the bottomless pit, and shut him up, and set a seal upon him, that he should deceive the nations no more,
till the thousand years should be fulfilled: and after that he must be loosed a little season.
Revelation 10:5-7 (KJV) And the angel which I saw stand upon the sea and upon the earth lifted up his hand to heaven, And sware by him that liveth for ever and ever, who created heaven, and the things that therein are, and the earth, and the things that therein are, and the sea, and the things which are therein, that
there should be time no longer: But in the days of the voice of the seventh angel, when he shall begin to sound, the mystery of God should be finished, as he hath declared to his servants the prophets.
1 Corinthians 15:52-53 (KJV) In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put on immortality.