Yeah, generally you get better in your sport in the 4-5 years you're in college. She was already putting up crazy numbers as a freshman on the men's team.

From Wikipedia:

> Thomas began swimming on the men's team at the University of Pennsylvania in 2017. During her freshman year, Thomas recorded a time of eight minutes and 57.55 seconds in the 1,000-yard freestyle that ranked as the sixth-fastest national men's time, and also recorded 500-yard freestyle and 1,650-yard freestyle times that ranked within the national top 100.[4] On the men's swim team in 2018–2019, Thomas finished second in the men's 500, 1,000, and 1,650-yard freestyle at the Ivy League championships as a sophomore in 2019.[4][3][13] During the 2018–2019 season, Thomas recorded the top UPenn men's team times in the 500 free, 1,000 free, and 1,650 free, but was the sixth best among UPenn men's team members in the 200 free.[14]

To focus in on her just-out-of-highschool low ranking, and imply that it's weird that she improved by the time she graduated, is deliberately disingenuous (not on your part, but on the writer's.) She had already won 3 silver medals as a sophomore on the men's team, and was the best on her team in all but one event.