Dunno why.
I mean, there isn't a law that says she has to, is there?
The only reason I can see for arguing about what language she uses is because you think she should be kind and respectful to other groups because they're marginalised?
As already covered, male transitioners don't have to behave in a kind and respectful way to women, an extremely marginalised group, not even lesbian and bisexual women, who are discriminated against on the basis of sex and sexuality.
This, it's all one way. Hibo must be sensitive and inclusive, to the luxury beliefs of white youths in the global north. Even when she bases her activism around being a woman and having a female body. She was criticised on the linked thread for being dismissive and saying she wasn't interested. That and making a pointed remark about "chest feeding" apparently indicated that she was "slightly transphobic".
The nasty thuggish men screeching expletives and threatening abuse at women in Manchester aren't even remarked on, even though they are entirely relevant to the general theme of this thread.
TRA men know they can ignore that. Because they do, after all, understand what sex is.