Oh yes, autistic people's mental landscape is wired differently, but it seems that if some of the defining and/or most common factors associated with autism also have to do with interpersonal interaction and touch, there would be some overlap and also some non-asexual relationships that LOOK like asexuality from the outside.

And regarding advice for teens, what you said is very similar to what I've said. I tell them to keep their options open and do not "decide" on a label which you then have to adhere to. I like to say labels are descriptive, not prescriptive. You should know that growing up and becoming mature DOES NOT require becoming sexual for all people (and if people are pressuring you to be sexual because they insist you can't be mature if you don't, don't listen), but at a young age when your body and mind are growing and changing a LOT, the most important voice to follow is the inner one. A little intuition, teens.