For extra context, various therapeutic methods do not work as well on neurodivergent people, especially people on the spectrum. CBT, one of the main go-to (adjunctive at least) therapies for example, is nearly useless for most folks on the spectrum.
So it may be that their therapists discovered they were not equipped to help op with their issue(s).
No, but I have a close relation who is both on the spectrum and in therapy who was told this. In the distant past I did have a background in medical research, so I went to PubMed and looked it up for them to confirm.