I don't see any solid reason to believe that Isaiah 14 refers to the end times beast.
There are a few, without a doubt clues that Isaiah 14 is referring to the end times beast.......but you must understand the clues.
Instead of dealing with that at this time, we should probably address this verse.
Isaiah 14:12
How art thou fallen from heaven, O Lucifer, son of the morning! how art thou cut down to the ground, which didst weaken the nations!
Is it possible that you see the word Lucifer in Isaiah 14:12 and that is confusing you? To clarify I prefer the King James translation......however in this case, there is a translation error. The King James translators were translating from Hebrew and apparently became confused with the Hebrew word. However, the translators also had the Latin Vulgate. There is the word "lucifer" in the Latin Vulgate. This is a non capitalized word. The King James translators grabbed the Latin word "lucifer" and capitalized it, making it a proper name. They should have translated the Hebrew word (which I can't write) or the word "lucifer" as "Day Star", or later used "morning star".
If you knew the story of Nimrod or the false religions that came from Babylon, you would would understand that when Nimrod died, it was proclaimed that he became the sun, or the "Day Star". As I told you earlier, most false religions have the "sun" as the male god. All that comes from Nimrod dying and claimed that he is the sun. FYI, it is claimed that a ray of the sun, impregnated Semiramis.......his mother/wife and she gave birth to the reincarnated Nimrod........Tammuz, the false savior. Tammuz is Horus of Egypt, Thor of Norway, Apollo of Greece, etc, etc, etc, etc.
Long story short, Isaiah 14 is talking about the King of Babylon, the Day Star, the Assyrian etc, etc and it is about the last days judgement of such.