I've thought about your statements and probably you do have enough evidence to back it up. This is an unusual case, and the evidence should be reported more fully when it is stated. i.e. people shouldn't just claim this without reciting the facts in detail.

More generally, I would not try to read that much about people's personality from their writings on the Internet.

I suppose in an exceptional case like this you can. But isn't it enough to say that the guy cannot communicate without derailing himself onto delusional-sounding and off-topic religious interjections?

That would not require a diagnosis and would explain to everyone why the community regards him the way it does.