So are you claiming that there is no historical bias towards downplaying women’s successes in general or that in history there was but now as a whole Earth has progressed so far that we have left all those behind? Or is it just that it doesn’t happen in sports but happens in other areas? Or women have been downplayed but never because of success but always for other reasons?
This to me is basic common sense: if a thesis works only on a handful of examples
What you call a handful of examples is taking a magnifying glass and only looking at this particular event. If %10 of successful women have ever been downplayed because of their gender (due to unconscious biases for example) vs %1 of successful men, then this is still a handful of examples which nevertheless points to a significant bias.