Eeeeeeeehhh its complicated. Gender and sex are different, but are sometimes used interchangeably. Male and female isn't strictly AGAB in all circumstances. The sex field on all my documents says female, despite the circumstances of my birth. Many trans women self describe as female, while others don't.

Transphobes often say female as an attempt to be exclusionary of trans people. Misogynists often say females, because calling half the population women implies we are people. Generally its a bad sign when someone says "female" as a noun.

But female as an adjective is pretty normal. A male model or a female engineer is a perfectly normal and fine way to describe people.

It's not about AGAB, this fucker is just talking confidently about shit they're clueless on. "Male" and "female" are constructed categories that have always been used to describe social and physiological phenomena alike. And furthermore, even if for whatever reason one were to use the terms solely to describe biology, pretty much all the traits that are used to categorise "biological sex" that actually matter in people's everyday lives can be changed.
It's neither accurate nor acceptable socially to describe trans women as "male" nor trans men as "female," and anybody pushing the narrative that it is is not our ally.