Underdeveloped or non-functional gonads are still identifiable as sexually differentiated tissue. A streak gonad, dysgenetic gonad, or partially developed gonad is still distinguishable as male or female tissue. That distinction is fact, not subjective projection. It is also true that humans can’t change sex. Some sex traits can be modified, but not sex.

My comment is limited to ensuring scientific accuracy. It makes no claim about whether sex matters for bathroom access and changing rooms.