Realize he's an adult, and can therefore make his own decisions etc, but since all the articles mentioned he had autism, I wondered (and worried) about whether he was high functioning? Low functioning? somewhere in between? Realize you sometimes have no control in moving (perhaps his parents had a job relocation) but wondered if their son would have the ability to find them since they moved to another state. There wasn't any more articles (that I found) to verify that they actually reunited.
If the severity of his autism makes him a fragile member of society, I hope that he was given resources so that moving forward, he is able to get a high school diploma and/or no longer be homeless if he chose not to go home to his parents.