First of all, the antediluvian-giant thing is more a deal of modern rendition than what the people back then would have read it. I mean... they did see the ancients as "great men of renown" and have this trope about "precursor tech" but the people wouldn't imagine tech like we might. Look, if you want to really dive into it, listen to this:
https://www.ancientfaith.com/podcasts/lordofspirits/land_of_giants
Second, this is such a hilarious misunderstanding of the Simiril that it loops back around to enraging. ESPECIALLY as Bob tries to pass himself as some knowledgeable geek. The prequel book (which I'm going to refer to as S because it's too hard to spell) is so obviously laid out by a Christian writer you can almost match sections 1 to 1 from it to the Bible. Like the opening chapter about the song of creation - obviously Genesis 1. You even have the figures in a garden who later get expelled.
Following that is the old testament period - or rather the first age which maps pretty obviously to Joshua, Judges, and the annals of the kings of Israel. This whole bit that Amazon is doing? That's all from the SECOND age. Which - again if you're paying attention - is more like Middle Earth's new testament.
Remember how I said before Bob is blue-curtain retarded? His brain just does this "matching" thing? Here you can see it again because he brings up "antediluvian" stuff. Well antediluvian would be early genesis, that which predates even Abraham. How can you say the SECOND AGE of middle earth is antediluvian? Well because the second age is ended by the sinking of Numenor. Flood in middle earth == flood in the Bible, see? Never mind that the sinking of Numenor was LOCAL and not a GLOBAL flood. If you want to maintain the parallels, it would be more akin to the sacking of the second temple and destruction of Jerusalem which is not explicitly mentioned, but understood to kind of be the "end" of the New Testament.
What makes it even dumber? Bringing this all back around to the aforementioned podcast, the nephilim were humans conceived of by pagan ritual where the "god" (or demonic spirit in the jewish/christian POV) would bond with a host the time. Thus, "antediluvian" time would be the period where Satan and his homies are literally on earth making demonic servants. You know what period of time in Middle Earth was LITERAL Satan walking about and fighting elves and humans? THE FIRST AGE. Sauron and stuff? The bad guy in this series. You know, the SECOND age? He's just a lower servant of the ME Satan. Just like how in second temple literature there was a belief that the demonic spirits mentioned in the gospels were the ghosts of those ancient nephilim left to haunt the earth. Again, not Satan, but those who has served him in the past.
This is what I'm on about! The more you know of BOTH the Bible and Middle Earth, the more Tolkien's inspirations and the parallels are super obvious. (Making Hobbit & LotR like the legends of King Arthur - post biblical stories.) But Bob here is so dumb he just runs half-assed over popular hollywood interpretations of this shit instead of digging down into the truth and original sources. Hence why he comes off even dumber than usual!
Also I await to be corrected by
@Mola Ram and
@A Very Big Fish who I think know Tolkien even better than I do. I certainly know which one knows more about pagan rituals.
