I don't discount this theory as plausible, but with all due respect, so what? Whatever name you want to give it, these children and their parents are really suffering and if vaccines have anything to do with it, that is a problem.
I do not vax because I'm afraid of my child having brain damage or death. I've met a ton of people on the spectrum that were happy. I've also met with people on the spectrum that were suffering so bad, and they were in agony. From my own experiences, the people who had regressive autism, seemed to be sadder.
Am I making sense. I know what I mean in my head, but it's hard to write it
eta: I believe people can be born with Autism. I also believe that people are being misdiagnosed with having Autism, when their problems are a result of poisoning.