Things like this aren't always discrimination. The article said one woman believes that men have better reflexes than women. I'm not sure if that's true but if it isn't there's not really any physical differences between men and women that should affect their ability in eSports.
I feel like this disparity is a cultural thing where women generally don't play video games as much or as early in life.
This happened in league of legends many years ago. There was some all girl team, even though there was nothing about league of legends that required men only teams, that many people were championing as a great thing about women being given equal ground. I'm sure they were better than me and a lot of the millions of people that play league of legends but the second they got to the "big leagues" they honestly got wiped the floor with.