Considering the way there are people completely out of touch with reality (Elon Musk, Mark Zuckerberg, Jeff Bezos come to mind, among many others), is it possible that maybe all that greediness made them lose their humanity? Probably not literally but I guess moreso in a metaphorical way.
From what I can tell, the lizard people conspiracy theory was started by David Icke, an antisemite and Holocaust denier. There are lots of conspiracy theories that come from the belief that Jews control the world either through media, some secret society or, in this case, by being shapeshifting lizards. This is just another iteration of the idea that Jews are different from everyone else and are trying to control the world.