Is it wrong for me, as a neurotypical person (AFAIK, there have been hints that I might have something undiagnosed), to use terminology coigned by atypical people? The way f'example stimming and overloading have been explained to me describe things that I do and the reasons behind them really well, but I don’t know if it’s appropriate for me to call them that.
Most people who stim a lot and get overloaded a lot are autistic. Most. Not all. Some people with ADHD also experiencing stimming and overload. So do some neurotypical blind people. So do other folks.
Overload and stimming are words that describe particular experiences, not a particular diagnosis.
If you have those experiences, it’s ok to use the words.