Unfortunately Izzard is in that modern trans group that involves part time cross dressing men. Who now feel entitled to call themselves women when they feel in the mood.
Even India Willoughby had problems with this a few years ago.
To me this is one of the daftest branches of transgenderism and one where we see the dodgiest looking unpassable males feeling free to come into women's spaces.
If Izzard wants to up his cross dressing that's his prerogative, but to say he is a woman makes him look utterly foolish, no matter how well regarded he has been, save for a tiny amount of cognitive dissonance diehards.