I read the same thing in news reports. It sounds as if there were ample ways they should have declined to admit the person, and instead they made special exceptions to their own rules so that they could admit the person. The women were locked in to lease agreements and would have been out of pocket for significant money if they had moved out, so they were really stuck in the situation where they were subjected to the inappropriate behavior. This seems like a case where the refusal to acknowledge the reality of sex has had a material negative effect on female-bodied people, so I am curious to see how it plays out in the legal world. If the sorority is not held liable for breach of contract, I think it essentially says it's game over for women's bodily privacy here.
There has also been an acquittal of a transwoman who disrobed in the women's locker room in Ohio and that was based on the failure to prove anyone saw male genitals. However the question of whether female-bodied people were viewed in the nude, without their consent, by a male-bodied person, was not addressed; leaving that concern out of news reports implies that women have no right not to be viewed by male-bodied people when we access public facilities, even when such facilities are officially sex-segregated for the purpose of allowing people who need to disrobe, to do so away from the opposite sex.