Hi Stefan - it's for Isha to answer, but I don't get the feeling she thinks she gave up her male card - perhaps even on 'female' days..? I think I'd see this as one of the differentiating aspects of being gender fluid - she won't/ can't be accepted as female because of the switching back and forth, but at the same time it confers some advantage of being able to lapse to male-mode to some degree, when required. I don't think this makes her (or any of us) any less authentic, it's just an aspect of complexity about us and the way we relate to the world in a variable rather than fixed-binary way.
More difficult in some ways - not so in others... Almost certainly more complicated when personal or professional relationships are involved and certainly ground-breaking... (possibly perceived 'ball-breaking' by some male colleagues, somewhat ironically... )
Katey x