From Chelsea's article, responding to the claim that one male isn't going to have that great an impact, (so we should all just shut up about it.
To recap: two male highschoolers compete against Chelsea in her running competitions, costing her a lot of opportunities:
And I’m not alone; these two biological males bumped more than 80 female athletes out of qualifying for higher levels of competition during numerous events over three years. [my emphasis, but that needs to be emphasised: two ruined the chances of 80. To date.]