I don't know what fraction of those athletes cheated. But I consider my definition of "win" to be reasonable regardless of how many competitors cheat.
This reminds me of a famous quote[0]:
> When Abraham Lincoln was asked by a prosecuting attorney, “How many legs does a sheep have?” He replied, “Four.” The attorney then asked, “If you called a sheep’s tail a leg, how many legs would he have?” Lincoln replied, “Four. Merely because you call a sheep’s tail a leg does not make it one.”
[0] https://quoteinvestigator.com/2015/11/15/legs/#:~:text=When%...