Im just gonna copy paste because I don't think I can summarize it better:

The word “neurotypical” is an informal term used to describe a person whose brain functions are considered usual or expected by society. This term is often applied to people who do not have a developmental disorder like autism, differentiating them from those who do. It is neither a mental disorder nor even an official diagnostic term.

Correct, DSM has pushed this notion that correlation and diagnosis of symptoms are well understood when under the DSM they are more loose associations of symptoms that say nothing of cause. You wouldn't group and heart attack and a broken rib as the same illness just because they both have the same symptom of chest pain. This isn't to deny the real symptoms people have though.

I chose the word NT because I think it's the least divisible label.

I don't choose or want to be neurodivergent, I'm reminded by NTs that I'm not normal in everyday life through social games and hints that I don't understand.