Futhermore, given that the large majority of LWers are socially liberal, I find it surprising that some of Azathoth123's comments get so many upvotes. It doesn't fit my model of the average LWer, even when filtered to assume that more consevatives are talking to him.

In itself, heavy upvoting of Azathoth123's comments doesn't make me suspicious. Eugine_Nier often got lots of upvotes, and I don't recall suspecting them of self-upvoting when they were posting under that name. (Though I have now started to wonder.) Other neoreactionary-leaning commenters like Konkvistador, Vladimir_M, Athrelon, and GlaDOS have solidly upvoted comments as well, and I've no reason to believe any of them have ever self-upvoted.

(Your other observations mostly align with mine.)