I'll never understand why these people, who are so confident and proud in their status as trans, don't embrace that status - and instead seek to hitch a ride on somebody else's status that doesn't apply to them.
Thus:
"Transwomen are women" - this is patently false and grossly offensive to women;
"Transwomen are men" - this is biologically factual, but upsets those male people who don't want to be thought of as men;
"Transwomen are transwomen" - I don't think anybody does, or would, argue with this; and nobody is confused by it (except those who aren't sure if the term means a man presenting as a woman or a woman presenting as a man - but either way, they can clearly work it out if they encounter the person or see a photo) - so why don't they embrace it? Every time somebody calls them a woman, they insistently reply "No, I am a TRANSwoman and proud to be so".