biology doesn’t equal gender he’s not a woman he doesn’t live life as a woman he doesn’t see himself as a woman nor does anyone else he literally calls himself a cuntboy if biology meant gender then everyone with a vagina in that world would be considered a cuntboy because that’s the term society has given him but they’re not they have different names for people with the same or similar genitalia from birth just like we do in the real world, cis woman, intersex, trans man, non binary etc
You're not even biologically correct. Sexual characteristics have a spectrum, and there are way more people who fall somewhere in the middle than you think. Even you might turn out to have intersex characteristics and not know it if you were to check your chromosomes and hormone levels. That's why sex verification in sports was abandoned.
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https://en.wikipedia.org/wiki/Sex_verification_in_sports

What gender is lil bro