Completely fake.
These were clearly made by human hands. They are more like bad anthropomorphic sculptures than anything with a legitimate bio mechanical structure. Not only does the skelital configuration not have human function, they don’t relate to animal skeletons either. IE: neck attachment to the head, shoulder and hip girdle attachment points, etc. But you can argue, that’s okay, because it’s supposed to be extraterrestrial, but it still doesn’t look the least bit functional, even if a biped evolved on some other planet. Those are not proper functional hip or shoulder joints what so ever, even if their head evolved to balance on their spine/neck differently than terrestrial life. The joints are just dumb right-angles like a child drawing a stick-figure!
“Not only does the skelital configuration not have human function, they don’t relate to animal skeletons either.”
So you’re saying they’re totally alien. LOL!