What this bullshit relies on is the hangover of the times when everyone referred to 'people with a cervix' as women and girls.
The implied 'of course women know they're female, silly' only works while this hangover of reality lasts. As 'gender' is taught to children, this will become less and less clear.
As healthcare adopts 'inclusive' language this will become harder and harder. Every step taken to eradicate 'women' and 'girls' from language puts understanding a step further back.
Girls are currently being taught in school and by the media and government that 'female' is a gender, a feeling. An identity, nothing to do with their body.
Girls are taught that not all girls get a period.
So - who gets periods? Who the fuck knows! Who has a cervix? Who could possibly say!
It's the reverse enlightenment.