The post didn't seem to mention how many women work at this place, but it's interesting that ALL of the women have apparently decided not to use that restroom. (Although I'm unclear how the OP of the thread knows this, given the she apparently uses only the unisex disabled toilet. )
Another thread today about trans women in the women's toilets kind of demonstrated that some women will speak up in favour of the trans women, and seem to have no concerns about sharing.
So it seems curious to me that suddenly all of the women stopped using that toilet. Unless the trans woman in this case is particularly objectionable or threatening. Or, ya know, it's a big pile of bullshit.