It is possible to include Transwomen in certain gendered contexts without agreeing to the dissolution of women's protected sex-based rights.
If the writing and publishing field , for example, discriminates against feminine gendered people, then why wouldn't those people with a common cause stand in solidarity? Whilst still agreeing that Transwomen in a refuge or a prison, for example, is a different matter?
In a field where black people were found to be under represented, a group of black women put together a photo of them all at the Globe, to make themselves visible. They defined the group as 'womxn' ...presumably there were some Transwomen amongst them, presumably they found femininity, rather than sex, to be a cause of discrimination or lack of representation.
Guess who turned on the campaign and filled their Twitter feed with abuse?
Clue: it wasn't racists.
People do have nuanced beliefs. It's real life. People agree, partially agree, agree with qualifications, agree depending on context..or disagree but still respect and listen to another's pov.