I don’t have a cite for this for the moment, but I have seen a few studies suggesting that it isn’t “educated” people in general that have more autistics. The one profession that passes along autistic genes more than any other is engineering. One working theory that autism and left-brain dominance may be related.
Yes, that’s the theory put forth by Simon Baron-Cohen, though he notes that more research needs to be done to confirm his findings. He also wrote about the “extreme male brain” theory.