Please remember that scores of teaching techniques under this broad umbrella -- applied behavior analysis -- is the most effective early intervention tool we have for young children with autism.
There are lots of other techniques that have been tried through the years. Few have delivered on the promise of a cure, or recovery, or whatever people want to call it when they think the autism has gone away.
Quackwatch has been around for a long time to help people ferret out all kinds of questionable medical claims. The autism world is so susceptible to these, Quackwatch has devoted an entire page just to autism.