My opinion? The ginger in the vids is an arrogant little bastard, even worse than me. I would take anything he says with a grain of salt for sure.
Yes, there is an overwhelming amount of possible evidence suggesting the existence of a race of giant humanoids that no longer exists. Everything else is purely unverifiable. Do I think they were the result of aliens or angels breeding with humans? No. It does not work that way, for the same reason that a guy having sex with a horse does not produce a centaur. Even if you are talking about science in the form of genetic engineering or insemination, it would be a product of technology, not the union of two totally different species.
I honestly think it is mostly bullshit that has been ingrained onto our culture by the forceful insertion of JCI. Giants, yes, but literal, physical nephilim that are the product of the union of a woman and an alien? LOL, next I suppose you will want me to believe a woman can be impregnated with the seed of a god without having ever had sex (virgin Mary)…it’s all bullshit, or at least the vast majority is. Zoroastrianism is no exception.