I mean if that guy meant that "evolutionary biology has nothing to do with gender" then I guess he would technically be correct since like I said before, transgenderism wouldn't really have a place in evolution. I still don't see how gender dysphoria can even be real if we dont see it in our close ape cousins. I have herd that chimps brains can follow similar patterns to several other mental disorders that humans face. (Complex PTSD, depression, and other psychiatric conditions) Although, its unsure if one could diagnose a primate, unless all the criteria for the diagnosis were observable behavior patterns. Even still, notice how there has never been one case of an animal experiencing gender dysphoria. No male chimp who follows behavior patterns similar to a female chimp. Even if he did, would that even be evidence of transgenderism in non human animals?