Still whataboutery. Women say no to sharing with strange penises. Now off you go and find a respectful solution that respects a woman's boundaries and right to say no
It isn't whataboutery.
There are 2 aspects to this situation - trans men and trans women.
I am assuming that whatever is decided about 1 will also apply to the other.
So if you campaign for trans women to be housed in male prisons because they were born male then a natural consequence will be that trans men will be housed in female prisons.
I don't see that a vulnerable female prisoner, who for whatever reason feels unable to be in close proximity to a man, will feel comfortable sharing a cell with a person that looms exactly like a man but just doesn't have a penis.
I think just be careful what you argue for.