Fitgirl is an alias. Fitgirl refers to herself as a woman, but I don't think anyone has any real personal details (which is a good thing as an anonymous distributor of pirated/cracked software.)
Fitgirl cut ties with Empress because there was a drama where Empress believed that repackers were unfairly benefiting from her work so she throttled one of her new releases in retaliation so that repackers could not get a hold of her cracks. So Fitgirl and a bunch of other repackers decided to not repack games cracked by Empress. Empress being a virulent transphobe was not an issue there.