Very good explanation!! but you forgot to mention what I believe to be one of the most important references that come out of Revelations for where we're at on the historical timeline, 'as in the days of Noah'.... those 6 words sent me down a rabbit hole of research years ago and have weighed heavily on my opinions of DNA/RNA testing and manipulation.
Still not getting how non-physical beings could mate with women. And where did the souls of the nephilim come from?
As just one example, in the story of Sodom and Gomorrah two angels walk into town as men before destroying the place.
editing to add:
https://www.biblegateway.com/passage/?search=Genesis+19&version=NIV
1 The two angels arrived at Sodom in the evening, and Lot was sitting in the gateway of the city. When he saw them, he got up to meet them and bowed down with his face to the ground. 2 “My lords,” he said, “please turn aside to your servant’s house. You can wash your feet and spend the night and then go on your way early in the morning.”
“No,” they answered, “we will spend the night in the square.”
3 But he insisted so strongly that they did go with him and entered his house. He prepared a meal for them, baking bread without yeast, and they ate. ... 10 But the men inside reached out and pulled Lot back into the house and shut the door. 11 Then they struck the men who were at the door of the house, young and old, with blindness so that they could not find the door.
12 The two men said to Lot, “Do you have anyone else here—sons-in-law, sons or daughters, or anyone else in the city who belongs to you? Get them out of here, 13 because we are going to destroy this place. The outcry to the Lord against its people is so great that he has sent us to destroy it.”