My mom's younger brother, who I also am sure had AS, had a very similar story to this man as well. he was a very shy, strrange yet functional boy up until about 16 or 17. then he started to have serious problems, becoming more and more withdrawn and difficult. He was in fact dx'd with schizophrenia, locked up and medicated heavily with the drugs they had at the time (this would have been the late 50's/early 60's). When they released him, he was a zombie and completely dysfunctional. He showed up on one of my aunt's doorstep one day. He stayed there for a couple fo days, and then disappeared. he was never neard from again, and the family just assumes he died somehow.
I've experienced something like "autistic catatonia" myself, when I was 23. I say "something like" because I wasn't completely dysfunctional and I didn't seek treatment for it, but it essentially destroyed my life. It was right after I graduated college - years of practicing music and 5 years to get my music degree, and all I could do in lay around in a dark room, occasionally getting up to go to the bathroom or eat something. At the time I had though that I was developing schizophrenia myself, because at times I had episodes of mildly delusional thinking and what I think may have been hallucinations. I just withdrew for the world for a few years. I almost ended up homeless, because I couldn't work.
But unlike schizophrenics, I recovered pretty much from it from rest and slowly intergrating myself back into society. I did go on a 18 month course of SSRIs when it seemed I was relapsing back in into it when I was 28-29. The SSRIs did help with the compulsive thinking (I was compulsively thinking about suicide all the time for about a month. This was the same time I got the nerve up to tell my shrink I thought I had AS (my shrink also reassured me that I was not schizophrenic, thankfully). Even though I had had some psychotic-like episodes in the past, I absolutely refused to go on anything stronger than Zoloft. You see, my brother who I also think has AS, was put on various psych meds, including a couple of atypical antipsychotics (he had been misdx'd as manic depressive), when he was a teen, and the result was horrific. I told my shrink that because my brother, I won't take any antipsychotics whatsoever.
After working in a psych hospital, my opinion of atypicals is more informed and more negative. Geodon's probably the worst, as it not only radically alters a person's personality, it cause a vast number of serious health problems, from obesity, to diabetes, to heart damage. It's like they're killing these people via Geodon, because it's essentially poison, and more importantly: IT DOESN'T WORK. The rest of this class of drugs isn't much better.
Bottomline: atypical antipsychotics are horrible, horrible, horrible. That austistics suffer worse on these drugs is no surprise to me.