How hard would it have been for him to check his facts?
The Nephilim are not the fallen angels, they are the sons of the fallen angels with the daughters of men.
Genesis implies very strongly that the Nephilim would have been much more likely to oppose Noah than support him. That the violence and evil of the world of their day was largely perpetrated by the fallen angels and their offspring, the Nephilim.
There are other ideas on who the Nephilim and the "sons of God" were, but this is the one I buy into.
That's for sure. Satan and his boys were trying to corrupt the Adamic race seedline from which Christ would eventually come. Noah and his family were the only pedigree linkage back to Adam, all the rest were hybrids at the time of the flood.
Excellent point, and I agree with you. The story could be much more exciting and even a bit techno-savvy with the facts.