Categorizing something as a “personality disorder” means there isn’t any other evidence of neurological dysfunction except on the person’s “personality”, their interactions with other people on a social level. Of course all psychiatric conditions will have impact on social interactions somehow, the question is whether that is all there is. It is quite obvious that autism is quite a bit more than that, so it isn’t considered to be in that category and that says absolutely nothing other than that, given our generally complete ignorance about how mental events arise from physiological neurology. (Not absolutely complete, of course; there are plenty of hypotheses and explanations, but generally complete ignorance nevertheless.) Whether a psychiatric condition is considered a “personality disorder” or a “neurological disorder” or a “mood disorder” or whatever isn’t important, or even useful, information, it’s simply a convenient classification for descriptive purposes.
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