those people are tall and have bigger eyes and elongated heads, and yes, they had a technology to levitate rocks, there is too many extremely large rocks weighting hundreds of tons that are with certainly transported hundreds of miles to their current location

the "giants" in Genesis are hybrids of them with humans, F1 hybrid vigor, extra large... like Goliath, he was one of these, like 8 foot tall... the normal ones were 6-7 feet, and you can find quite a bit of descriptions of humanoid "aliens" like this especially among the stories of ass probing and phantom pregnancies and whatnot