Those cases are different and you know it. The athlete mentioned above is Lia Thomas. From wikipedia:
> In the 2018–2019 season she was, when competing in the men's team, ranked 554 in the 200 freestyle, 65 in the 500 freestyle, and 32 in the 1650 freestyle. In the 2021–2022 season, those ranks are now, when competing in the women's team, 5 in the 200 freestyle, first in the 500 freestyle, and eight in the 1650 freestyle.
How am I excluding cisgender women? I am arguing that forcing cis women to compete against trans women, who have the undeniable advantage of being born with a male body, is unfair. Athletics are separated by sex because, as a rule, men are just bigger and stronger than women. Like another commenter pointed out, if we remove this separation, 99% of female athletes would no longer be able to compete.