Did you read the articles attached to the headlines?

They found that ski jumpers can get a measurable advantage is thier suits are loose fitting, because it increases drag. As a results, their suits are carefully regulated and they are made based on a full body 3D scan.

It’s been speculated that some ski jumpers may have been taking injections meant to increase the size of their flaccid penis before that scan, so that it will be included in the scan, and then if they are back to normal size before the competition, it has the effect of their suit fitting more loosely and increasing drag.