Being school educated or home educated has absolutely no bearing, though the school will likely suggest otherwise (and to be fair, this could simply be that they don't have any experience or knowledge of HE and actually just don't have a clue!).
You will find lots of professionals are the same and just don't know about HE at all, so you will spend lots of time saying the same things about how many social opportunities DS has, yes he still has to follow rules in life (we all do!), no he isn't socially isolated, yes he can still have a routine (it will just be one that suits him perfectly!!!) and all of the other usual things that you'll just get used to saying.
To be honest, HE has a huge proportion of ASD children (mine included) and after a time, lots don't need to access certain services as they find so much support in he HE community as well as the fact that some issues are definitely alleviated by not being at school. Other people find that they really do use the services and use local facebook groups for autism specific meets, events and such and plenty still access SALT, though I guess the experience depends on the professional that you are dealing with, although that would be true of a school educated child to an extent, just less ignorance.
Personally I can't receommend HE highly enough for children on the spectrum - joining your local HE facebook group and the national HE with special needs facebook group will really put your mind at rest...there is a wealth of experience and knowledge around.
It works wonders for us and all of the other children we know with an ASD diagnosis (I haven't heard of anyone going back to school in the past three/four years anyway!!!!).