That is a good question... -You mean Elohim, I guess. Nephilim were the giants who came out by the interbreeding of the Elohim with human women.
We are still missing the RV links between the Annunaki and the Elohim. And also between Zeus and Yahwe. But Mauro Biglino can draw at least the last one from his investigations into the Bible and the Greek mythology. Then we have the promise of return. And what about the handbags - these show a connection between many cultures.

There may be a core of truth in Clif High's confident claims of the Elohim returning. -I don't know, but the topic is for sure exciting...
But it is maybe too far fetched that the Peruvian incidents have Elohim involvement. There are hints that these were humans, one with "Gringo" accent and the other speaking Peruvian Spanish. (But this can also be wrong memory of the traumatised victim.)

Alternative explanation - special forces types are harvesting material for level 3 prosthetic disguises.

I am not saying which country they could be working for, but nontheless, if you wanted totally convincing human masks that even a human would think was human, that would be method, and certainly, intel services do use such things.

No aliens necessary. This could be humans doing it.

The CIA already have perfect rubber masks...
But the mask idea is very good nontheless: maybe they need the faces to create perfect Hubrids or Human-like androids.
There are hints for ET involvement as well -not in the village, but in the next bigger town. There the facepeelers on the flying discs and a UFO have been seen and an ET may even have been filmed. (youtu.be/mpCxDqvT7lg?t=4437).
This ET may have been some kind of Mantid or insectoid creature 7-9 feet tall (2,1 - 2,7m).