Trans women aren't biologically the same as women obviously and it's not like they'll take anyone's place in any way
Transwomen have taken women's & girl's political places, places on sports teams, scholarships, awards.
So yes, calling them women, and allowing this, does take away from women.
And there is no shame in women wanting female only changing rooms, toilets etc - some women don't mind mixed-sex spaces - but the ones who do should not just be brushed aside and ignored.