Logically speaking, if it is a single sex space then all women should be able to use it regardless of how they present. Saying you must be femme presenting in order to use it means the space is then only for femme presenting females, not all females.
When it is about sexual assaults in toilets, it does matter that these are by men, regardless of how they present. These are by men who look like men, men who look like women, and men who look like men but pretending to be men who say they are women for the duration of being in the women’s toilets.
Stating you must be female in order to use the women’s toilets means, if obeyed, there are no rapists in the toilets. Stark, but true. Good men stay out so bad men stand out.
Also true is that small girls to women in their seventies have been raped in toilets that are open to the public. However mixed sex designs are overrepresented as a design in these cases, whatever they are called: universal/ unisex/ accessible/ disabled/ gender-neutral/ genderless/ inclusive.
Logically speaking, the safest toilet provision is single sex cubicles within a single sex environment.
Edit: I understand the poster is trying to discuss appearance now. But I am responding to this paragraph in terms of how people present rather than their sex. I worry about all women using unisex toilets, however they present.