Oh Good Grief.
It’s amazing to me that people think that something exhibiting in areas where people have lived for thousands of years, must be from ‘aliens’.
(They are giving pretty short shrift to human beings and the intelligence of same.)
People tend to do that because they attribute less capable technology with intelligence.
You may need to be *more* intelligent to survive with less effective tech.
My studies of history and prehistory indicate most older populations were as smart as us, if not smarter.
They were limited by tech, but not because of a lack of intelligence.
If someone took out his spray cans and painted that snake-like image on a wall in LA, people would take it as pure fantasy.
But when they find the same thing done by ancients, they immediately start finding deep religious significance in it and even extraterrestrial connections.
Sometimes graffiti is just graffiti, and nothing more.