It’s saying that the conditions and traits that tend to select for IT people is often represented in autistic populations. Anyone that’s managed in IT can attest to this. Maybe “half” was a figurative exaggeration for effect, but you seem to be injecting an entirely different meaning and bias into the comment.
> I’m not vilifying you, it was just a poor choice of words.
You're not being honest here. Questioning someone's belief and calling it gross is vilifying, regardless of any agreement or lack thereof from a broader community. Additionally, finding the one disagreeable point and harping on that instead of any of the rest of the points they made is another means of vilification.