you sound a bit confused and that you think it's biological men that they're referring to? They're referring to trans men - ie, biologically female so could still quite easily have periods!
No one's really confused, just poking fun at the absurdity when you imply men/males can have periods.
We know transmen have periods, because they're transmen. So there's no reason to avoid saying women and transmen, unless of course, they're really doing this to please the ejaculators that don't want us to have the word woman. Of course they're also now dressing it up as concern for women who have gone through the menopause or don't have a uterus who'll be traumatised to see the word woman, when in truth they didn't give a flying fuck about these women until it suited them.
Transwomen may need Viagra, condoms, prostate exams, but I don't see a push to dehumanise men to include them, do you? Wonder why that could be...