Teaching self-acceptance is generally fine, but I feel like in this case, this is a cop-out and the person isn't able to provide the help and support you require.
I've run into this issue myself with my adult autism diagnosis - providers refused to provide a diagnosis or provide me a pathway to receive an evaluation from somebody qualified to do so. Even when I needed accommodations for college, they just sat silent, refused to address my concerns, and quickly changed subjects.
Turns out I do have autism, and they were just barriers to me accessing diagnosis and all the benefits that come with it. I likely have ADHD as well, but none of these providers gave a shit. They just focused on my anxiety and tried to reason me out of my state, focused on having me changing my behaviors and reactions (mask even harder), gaslit me into accepting that I'm causing people to traumatize me and letting myself be traumatized, and so forth. I was already high-masking, but I desperately needed supports and they had nothing to offer. They acted as if my high-masking appearance was my baseline and the anxiety was the inhibitor - which cause me an immense amount of harm. They also refused to address my significant trauma history and PTSD.
Find someone else who is qualified in ADHD and don't get fucked around like I did.