Hi
A similar unit was also considered for my son. The children there had emotional difficulties which were not brought on by ASD and I felt the whole approach was very different to what he needed.
Although I am sure this place did take some with ASD, my son had reached a point whereby his emotional needs were of more importance than his academic needs.
Anything other than ASD specific support would have exacebated his difficulties and confused him even further.
However, you know your son best and what would be a positive move for him. I know it is hard but I think you are doing a brilliant job. <'>
Sam