I noticed the same things and that lead me to suspect autism for my son as well. By middle school, his social interactions were worse, not better, especially reading intention and other nonverbal communication. In addition, he was very inflexible and we were battling school refusal due to significant anxiety. It took 3 clinicians before we got the additional autism diagnosis, because his ADHD symptoms are so overt, and the autism is more subtle.
The addition of the autism diagnosis helped me understand my son better. That, in turn, helps me to help him more effectively.
Here’s more on ADHD and autism co-existing:
Great news about being at an awesome, understanding school! Wish all our kids had that opportunity!
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism