I thought it was clear. But:
I'm suggesting that advice in past years to trans women not to use women's changing rooms if they still had male bodily traits..... may feasibly have been purely pragmatic advice. In other words, it wasn't that trans women with male bodily traits weren't allowed/entitled to use women's changing rooms if they so wanted - it was that doing so might have fomented unrest or disorder of some sort. And that any such unrest or disorder would not have been in the interests of the trans woman in question (or trans women in general) in any case.
In other words: even though you're entitled, it might be better for you if you choose to stay away - so long as there is the possibility of disorder/unrest, owing to unreconstructed public attitudes.
The fact that you choose to take away from my original post that I'm comparing - in an absolute sense - women with black people, is, well, I'm at a loss myself.
But if it makes things easier: imagine a bullied boy at school, and the head teacher saying to the boy: "I think you ought not to use the boys' bathroom on the ground floor, because there might potententially be trouble for you if you do". It's not that the boy is not entitled to use that bathroom: obviously he absolutely is entitled. Rather, it's that it makes pragmatic sense at that point for the boy not to risk causing unrest (regardless of the fact that any such unrest would be unacceptable and wrong in itself).
Hope that's made things clearer, now that the reflexive "race" flag isn't allowed to fly any longer......