Obviously, someone that is not born, raised, and living as a female can never experience the "whole package" of being female. However, most GGs are probably not 100% female either. I think it is reasonable for a TS to claim that they are "being a woman" even if there is no way to be "100% woman". Most people wouldn't tell a GG that they can't be a woman if they were raised as a boy, or if they were born without a uterus. It just comes down to how picky you want to be in defining a woman.