Earlier quoted context omitted.
> Your assumption that being autistic somehow completely disqualifies one to speak competently to others... As anyone can see, I did not write that.
The word completely does over-assert that quote, but it's disingenuous to pretend that the quote does not follow from your overall point. People with good "theory of mind" would supposedly read between the lines, but I guess it was never that simple. Spoiler alert: there's no such thing as one true generalized theory of mind.
"Theory of mind" means, among other things, having a good mental model of what other people know and don't know.
Obviously, without understanding what piece of information the other person is missing, it's very hard to explain it to them.