It does not harm a transwoman to put them in a third space in the prison estate, or provide a third toilet space, or refuse them permission to do smear tests on unwilling female patients, or for them not to compete against women in a sporting competition.
None of these things cause any harm to transwomen whatsoever.
However, if each of these things are disregarded women will be and have been harmed.
This is not an equivalence situation. It's the powerful class attempting to stamp all over the scant provision for the less powerful class. All the dressing up in the distracting rags of pretend oppression won't change that.