It isn't even that. Because even if you do believe that "being female ... is an identity that can be adopted" all that means is you want to change the people a word refers to. It doesn't actually remove the fact of two human sexes, nor require that the female half of the species not be named or recognised at all.
The thing that proves, unequivocally, that fir all their guff about "self determination", what sexist people like Howse and Bailey really want is not a new understanding of what a woman is at all, but appropriation and subjection of the female sex in support of men, is that even as they tell us our name properly means something else, they do not allow us to define ourselves outside that name.
For Gender Absolutists like Howie and Bailey it's not enough to change what "woman" means, we must also submit to that new meaning regardless of how we may know ourselves and have our own life experiences.
Only one side in this is saying that the reality of sex and groups based on identity and presentation can't both exist under different names for these different things.
Only one side is trying to prevent any cultural, political or social recognition that sex has consequences especially for female people.
Only one side is trying to rewrite Feminism to support the subjugation of female needs in favour of men's feelings.