Far reaching I know but here goes...
“This calls for a mind with wisdom: the seven heads are seven mountains on which the woman is seated; they are also seven kings, five of whom have fallen, one is, the other has not yet come, and when he does come he must remain only a little while. As for the beast that was and is not, it is an eighth but it belongs to the seven, and it goes to destruction.”
Revelation 17:9-11 ESV
The Assyrian being the antichrist and His spirit was in seven kings, which at the time of revelation five kings had already lived under the antichrist spirit, one king was ruling that had the spirit guiding him and a seventh will come that will only be for a little while and there is an eighth who is resurrected (I won’t speculate on who these kings are, but it is always associated with a world ruler that tries to get rid of the nation G d made for Himself through Abraham, Isaac and Jacob).
“The beast that you saw was, and is not, and is about to rise from the bottomless pit and go to destruction. And the dwellers on earth whose names have not been written in the book of life from the foundation of the world will marvel to see the beast, because it was and is not and is to come.”
Revelation 17:8 ESV
Notice that the beast was, is not and is to come. This is understood to be Nimrod who was technically an Assyrian based on geography, he was after the Babel encounter due to the diversification of languages known by many names including Gilgamesh, Osiris, the Bible calls him Appolion or Apollo but is one and the same and this passage is saying that though He is not now, he will be resurrected from the dead and DWELLERS will marvel at the beast what was, is not and will be. His spirit has been in previous seven kings.
He is coming on the scene for destruction.
Essentially Nimrod is believed to have become a Nephilim not through genetics but through sorcery and incantation. He essentially invited a satanic entity or satan himself to indwell him and take dominion over the earth using his body as an instrument. satan we know was in the garden of Eden and Nimrod we understand from Jewish writings suffered a head wound. He seems to fit.
It’s messy but this is AN explanation. Also it’s believed that Nimrod’s body was discovered and preserved in perfect condition in Iraq a week before the Iraqi invasion in the 2003 and conspiracy has it that “they” are working through ancient occult ritual practices to resurrect or through genetics found in the mummified body to recreate him. The ancestry DNA craze is merely an attempt to find those with markers on the X chromosome (think x-men) that have Nephilim genetics or seed from the sons of G d that came down to earth in Genesis 6
These are not considered the same as
“And the dwellers on earth whose names have not been written in the book of life from the foundation of the world”
But these dwellers are the offsprings of the initial sons of G d and women who copulated together because they did not have a NEPHESH and cannot return to G d they are trapped on the earth as disembodied spirits and would become the daimons or the demons who do the bidding of their fathers the fallen sons of G d in Genesis 6 spoken about by Peter and Jude who abandoned their abode.
Technically just because the human gene pool is contaminated with angelic genes/seed so long as the father and mother are human the offspring has a nephesh and can be saved by the Blood of Jesus. These daimons cannot because their names were never written in the book of life from before creation. Out of the book of life you can either remain or be expunged but no verse shows that a name can be added or written in.
Also concerning the Assyrian and cedars
“"Yet it was I who destroyed the Amorite before them, whose height was like the height of the cedars and who was as strong as the oaks; I destroyed his fruit above and his roots beneath.”
Amos 2:9 ESV
The Amorites were as tall as cedars and while many dispute that there were giants 20-60feet tall because there is no skeletal evidence, bones unless fossilized done last more than 1,000 years in the ground. Anyhow
This Amorites are considered to have been giants because they inherited genetics from before the flood that crossed over the WORLD WIDE flood into the new world and therefore had Nephilim genetics. By the time of David these giants started getting smaller because the genetics was being diluted.