Well, you met this person, me with a milder form of PDD-NOS (a milder form of Atypical Autism), known as ASD Level 1.
I used to have severe communication delay and Fregoli delusion until I turned 17 years old my social skills improved drastically and my Fregoli delusion remitted by reading books about body language and doing self-therapy, even though I had an IEP goal to improve my social skills, but the school did not help me in any way to learn social skills, so I took it to my own hands and learn it myself instead.
I also studied ‘Forensic” Psychology as my restricted interest.