It has been shown the woman who won Olympic boxing is in fact a cis female.
No. No it has not at all, that is an outright lie. He (Imane Khelif) has failed two separate, independent sex chromosome tests, because he's XY. Male, a man.
A trans woman should he allowed to use a lady's changing room or toilet..
No he should not, that would be a breach of the Equality Act and in some cases, Health and Safety ar Work Act. Please familiarise yourself with the Supreme Court Judgment, in the FWS case, April 16th 2025.
They are explicitly excluded from women's facilities, because they are men. This is medico scientific fact and is enshrined in law.
They have not 'stolen' anything from cis women, they are fighting for their right to exist.
Of course they have, women's prizes for life achievements, sporting medals, places on women only political short lists, rape crisis centre places and jobs. The feeling of safety and dignity in toilets, changing rooms and prisons.
Finally, go to Hell with your unnecessary, grammatically incorrect "cis." It means, geographically, "on this side of." Trans, in that case, means on the other side of.
Trans people use the trans prefix to mean "changed."