That's an amateur theory, and yes, that theory also claims that these guys aren't humans, rather reptilians who thrive on childrens blood. But the theory I am talking about, believe me you don't wanna hear of it because it sounds too real with evidence and backings throughout the recorded human history. It would shake you, traumatize you for days.
It's a very long theory and to understand that, you must have sound knowledge of mythology, ancient history, theology, psychedelics and a lot of various conspiracies. Without that, you wouldn't understand that.