I fully agree with you, and I think this trend of glorifying disabilities is cringe - ADHD, autism, etc. are life-altering medical conditions and not desirable.
However, I don't think this specific project is intending to glorify ADHD or help people claim they have it - it's just piggybacking on the idea that telling current-gen LLM models that you have ADHD (allegedly) produces better results for everyone.