You are also applying a good standard for all prophecy. The Revelation of Jesus Christ is the fulfillment of all prophecy, like a puzzle's picture on the box to be used when piecing the puzzle together. And so we must first see the fulfillment photo of all prophecy, by interpreting what we can of Revelation on it's own first.Some points I see on Rev. 20:4 -
Examining the phrase "souls of them/those" in Rev. 20:4, and where is that phrase found?
"souls of those" in the Bible is only found Rev. 6:9 & 20:4 in YLT, RSV, REB, ESV, NRSV
"souls of them" in the Bible is only found Rev. 6:9 & 20:4 in KJV, RV, ASV, Douay
g5590 psuche g4969 sphazo Rev. 6:9
g5590 psuche g3990 pelekizo in Rev. 20:4
"psuche" is "From G5594; breath, that is, (by implication) spirit, abstractly or concretely ..." 1890 Strong's
"pelekizo" is "From a derivative of G4141 (meaning an axe); to chop off (the head), that is, truncate: - behead." 1890 Strong's
"sphazo" is "A primary verb; to butcher (especially an animal for food or in sacrifice) or (generally) to slaughter, or (specifically) to maim (violently): - kill, slay, wound." 1890 Strong's
And so, you show where souls are spoken of at least twice in Revelation. A caveat however must include Bible doctrine to interpret prophecy. In this case, only the souls of men and women are created in the image of God and only those souls saved and justified by Christ can be in the presence of God at death of the body (Rev 6), and seated in their own thrones with Christ after the resurrection of the bodies. (Rev 18)
The souls of men and women are also spoken of in Rev 18, as being used as merchandize from Babylon for all merchants of the earth. This shows where that great city Babylon is also ministerial in nature, as well as in practical business affairs. It's called turning the Father's business into a worldly people business for ministerial power and profit.
The phrase "thousand years" is found in the following places, apart from Revelation 20.
"For a thousand years in your sight are like yesterday when it is past, or like a watch in the night." Ps 90:4 NRSV
"Even though he should live a thousand years twice over, yet enjoy no good—do not all go to one place?" Eccl 6:6 NRSV
"But do not ignore this one fact, beloved, that with the Lord one day is like a thousand years, and a thousand years are like one day." 2Pet 3:8 NRSV
The problem here is not first establishing that the thousand years of Rev 20, that is mentioned 6 times in as many verses, are 'a' and 'the' thousand years, which can only be read as literal. The fact that they 'expire' exactly at that thousand year point to the day further confirms their literalcy. Therefore, they cannot be compared to Bible doctrine on God's timeline of a day being as a thousand years, and a thousand years as one day. To conflate the two, would be a bad interpretation for both timeline doctrine of the Bible, and the thousand year reign of Christ on earth. Turning real events and times in the Bible into symbols is a more common error in Christian teaching, there there ought to be. Afterall, the world does the same by making any miracle of the Bible into just another symbol or fable of man, such as parting the Red Sea, and causing the sun to stand still.
For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty.
Notice how this verse purposely includes the Lord's coming to earth as not being symbolic, which includes His first and second coming. He literally has come first in the flesh as the sacrificial lamb of God, and literal comes a second time as the Lamb with power and wrath, to inherit and rule all nations for a thousand years.
We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts:
We also notice how prophecy also is to be treated as literally as doctrine of God. Rev 1:3 promises the blessing of not just hearing and interpreting prophecy correctly, but also of keeping those things in prophecy as the faith and commandments of God.
That's how some Christians do away with torment of hell and of the lake of fire, by making it symbol only.