The Labour party is having a leadership election in which Rebecca Long Bailey is an outspoken proponent of trans rights and issues. The statement you're trying (and failing) to disprove said "are not allowed to acknowledge positively in any political campaign" but she's clearly both allowed to positively acknowledge trans rights in a political campaign and is actually doing so. Thus your attempted counter-example is wrong, and I think you knew that.

As for straight white men, I'm trying to remember the last time the leader of a political party or writer of a newspaper column went to bat for those people's rights. Can't actually recall one.