Correct me if I'm wrong but I assume you're talking about xenogender, could you please explain how they're harmful if they were created for and by neurodivergent people to help better explain their gender identity? I'm trying to educate myself more
Its similar to agender, I'm just going to describe it the way the wiki does, "A common way to describe this gender is a pot with soup inside. Those who have a gender may have soup in their pot with contents that makes up their gender, whilst those who are gendervoid may feel there is no soup in the pot, as in there is nothing where a gender should be"
Its similar to a sports bra but it's made to compress your chest and give you a more masculine flat chested look, it's mostly associated with trans ftm people but it can be for anyone