They clearly care about women enough to go through what they have to live as one so I think they may make very good advocates for women in some ways
You can't 'live as a woman'. There is no such thing.
Being a woman is material a reality involving biology. From contraception to pregnancy, to rape, endometriosis, menopause, wifework, sexism, gender pay gap, FGM, honour killings.
Literally no one is stopping any man, trans or otherwise from supporting feminism.
But that's not the way it works. Transwomen who represent women prioritise trans issues, not women's issues. Unsurprisingly, they do not understand, nor care about women's issues.
Lily Madigan who is a 19-year-old boy representing women as the Labour Party women's officer, maintains that biology doesn't matter because he has as much chance of getting pregnant as any other woman because women aren't fertile all the time. So you mustn't single him out on that basis.
Shon Faye, another famous transwoman tells women to enjoy their erasure.
Paris Lees who writes for mainstream media tells women that section harassment is like being 'eye fucked' and it's hot to fuck someone who is crying.
India Willoughby maintains that her breasts are not sexual so there's no reason why she can't get them out in public.
Jane Fae is apparently 'frightened' of Jenni Murray.
Men who transition to be women either have gender dysphoria, in which case they are not the best people to represent anyone. Or they are fetishists (AGP).
The very last people to represent women are those who fetishise womanhood and female biology.