I think you two are arguing cross-purposes (SovereignGrace & KJV1611). You are both right. Isaiah 14 is speaking of the attempt of Satan and man to ascend and usurp God's authority. Read it all again and then look at the beast man of revelation.
(The Antichrist fellow you know is coming) And look at Daniel Chapter 11:36-39
Nebuchadnezzar is used in several places in scripture as a type of Antichrist as well as Hiram, King of Tyre, The Assyrian King and others in near/far fulfilment.
You claimed to be a god! but you will be brought down to the pit! Prophecy is in some ways like the history of the future. There is a detailed clue to his identiy in the Hebrew (Semitic) term used in Isaiah that the KJV has covered over with the Latin title 'lucifer', though lucifer does reveal it in part. Scripture frequently uses stars as representation of angles. (you have likely noticed this)
I can do a whole teaching on this that would take up pages but I'm not supposed to teach men
I will remind my brothers though that this collection of books we love is Middle Eastern in outlook. Not American or European.