We don't need to demonstrate it because men can't take advantage of the gender diversity wave, they were talking specifically about untalented women(in tech) taking advantage of diversity programs that are supposed to help talented women. The reason this is important is because it creates the stereotype that the reason women need diversity initiatives is because they are not as good as men are in the field.
The difference is that when they get caught they are swiftly dealt with. There is no social pressure to go easy on men in tech. If a man exaggerated his technical skills to the point that he was claiming to be a hacker and open source programmer but couldn't point to any programs or actual contributions of code, he would rightly be laughed at and dropped from a hiring pipeline. If he was busy making such claims to the media, journalists would investigate and expose him.
The incentives not to do this mean that whilst it does happen, I feel it's much rarer. I don't remember the last time I encountered a male journalist making unsubstantiable claims to be an open source contributor.