Wow, the 200m freestyle, the 500m freestyle, and the 1650m freestyle, huh? Did she ever compete in anything else, or were those numbers perhaps cherry-picked to make the situation look more dramatic than it actually is? Because if you look at her results holistically, she's a very good swimmer, but she's clearly not dominating 100% of the time the way she's been portrayed.
At the NCAA competition where Thomas won one (1) race that conservatives cried and shit their pants over, a cis woman named Kate Douglass set 18 new records. Lia Thomas set zero new records. And crunching the rest of the numbers bears this out: she was a good swimmer before and after transition, but she's not some unbeatable powerhouse that cis women have no chance at winning against.
Check Caitlin Doughty's "Ask A Mortician" videos, in addition to some of the other suggestions.