Fwiw I don't think he was pulling shit out of his ass. Lots of weird shit going on these days and some people just don't know where to draw the line between legit conspiracies and fantasies. If yesterday you knew nothing but today found out about a cabal of child-eating Kabbalist politicians, but then heard they were also ancient reptilian aliens, you might believe it having just had your world shattered by the previous revelation. It might take time for some people to filter out what is true or not.

Factor in that there probably are real (military) UFOs for decades, and that the military covers it up by having their own people periodically "spill the beans" on alien coverups, and then you've got guys like David Icke who referred to DS people as Reptilians to cover his own ass, but a lot of people take it seriously. And also factor in that we really only know what we are told about these things and have to figure it out for ourselves. There's plenty of room for smart people to get it wrong for a long time. Sometimes, maybe, people have to go through a phase of mind-opening to let everything in, to concretize it in their minds so they can compare it to reality and figure out for themselves what is probably false.