Trans women have competed as women in the Olympics once ever and have 0 medals. By the numbers it's a non issue under previous rules (despite the incredible amount of ink spilled over it). People are talking about trans women here but the vast majority of people affected by this change are women who are not trans who have a "disorder of sexual development".
The IOC policy is specifically that athletes need to test negative for the SRY gene to be eligible to compete in the female category. Imane Khelif won gold in the 2024 Summer Olympics women's boxing event, and has since admitted to having the SRY gene. So it isn't a non-issue. https://en.wikipedia.org/wiki/Imane_Khelif#2026
I don't see anyone ever going "oh, Michael Phelps has unfair advantages because of this crazy gene". Then, it's fair and square, just better genes life's not fair. No, suddenly the care now, eeeeveryone cares now about woman's sports because someone with a rare genetic disorder showed up in the spot light. Utterly bizzare for me.