You'll have to ask the Jehovah's Witnesses if they say that; I can't confirm it because I am not a member of the Jehovah's Witnesses. But, "Jesus came to them and spoke to them, saying, “All authority has been given to me in heaven and on earth”", (Matthew 28:18), in which case I'm sure many people will refer to Jesus as a mighty god. But Jesus does not have authority over his father and his God, Yahweh, as I have show before from 1 Corinthians 15 (WEB):
24) Then the end comes, when he [
Jesus] will
deliver up the Kingdom to God, even the Father; when he will have abolished all rule and all authority and power.
25) For he must reign until he has put all his enemies under his feet.
26) The last enemy that will be abolished is death.
27) For, “He put all things in subjection under his feet.”
But when he says, “All things are put in subjection”, it is evident that he is excepted who subjected all things to him.
[Quoting from Psalm 8:6.]
28) When all things have been subjected to him, then
the Son will also himself be subjected to him [
God] who subjected all things to him, that God may be all in all.
Paul is very clearly saying here that God, the Father, has made all things to be subjected to Jesus, but that it it obvious that God Himself is not subjected to Jesus. On the contrary, Paul says that Jesus will be subjected to God. As usual though, you just can't seem to understand, or bring yourself to believe the plain teaching of the Scriptues, and you continue to stubbornly only take notice of a few controversial verses with debatably incorrect translation into English, in an attempt to support the false teaching og the Trinity. That shows a lack of common sense!