I'll address @Alberto Balsam's questions myself seeing as I have the greatest familiarity with those concerned here:
When'd David lose interest in Aspergia?
As far as I know, he never had. You can go to my blog and see one of his most recent statements on the matter. He has given up on the idea that Aspergians can be cogently persuaded to endorse the ideology and is beginning to entertain the possibility of establishing a compound populated by those kidnapped into his "covenant" as it were from youth.
How much have his current theories changed?
He's given up on theoretical considerations. One of my last exchanges with him in December of last year has him denouncing the philosophical as an overly-sophisticated waste of time that just ends up having the ideology capitulating in acknowledgement to neurotypically phrased terms. He'd rather now that we get practical: leaflet distribution, street-proselytism, think of everything that the likes of the NOI or the scientologists do today.
Aspergianism has now split into two camps: Aspergianism-Chacism is basically the neurodivergent-centric (we're not neurodiversitarians and I'm at loss of how we should actually describe ourselves) equivalent to a panhandling televangelist sect within the ideology, and you have Aspergianism-Sophism/Aspergianism-Autphagism, which wishes to see a legitimate nationalist movement formulate on theoretically based grounds.
Was he ever one for splooging out essays or has he had the relative sense to confine his autism to short posts?
To answer your question succinctly: he taught me my composition method, which in itself is quite highly derivative of speculative theoresis from the late 19th and early 20th centuries' meta-political and meta-scientific works (as scientific methodical convention was slowly becoming derided for socialistic influences; rightly enough, the main aberrosexual theorist of the era, Hirschfield, was a Marxist Jew). For what mechanical weaknesses he had in his writing (terrible speller for one), he was quite grammatically and rhetorically adroit, if lacking the enudrance, relatively speaking, of my own works.