A good amount of the conditions lumped together as “neurodiverse” are either comorbid or share some traits. It’s reasonable people with these separate conditions may still want to connect with each other because of the commonalities between them. Nobody’s forgoing the words “ADHD”, “autism”, or “OCD” for the more generic “neurodiverse”, they only use “neurodiverse” in place of “people who have ADHD, autism, OCD, or [insert other conditions here]”.