I think diversity is useful on a panel evaluating a piece of art. The more people you have from different walks of life (gender, race, sexuality, class, lifestyle), the more thoroughly you can examine how a piece of art resonates with humanity as a whole.
At the same time, the jurors should be thoroughly qualified based on actual merit. No one should be selected simply because they are one thing or another.
But like Finale Fireworker said, this imbalance is probably indicative of a larger problem in the industry, where women generally don't feel welcome due to hate groups, shallow depictions, etc. This results in fewer of them joining the enthusiast press.
This doesn't seem to be anything malicious on the part of the Game Awards. It appears the individual outlets nominate their representatives (Polygon chose to have a woman, after all). So if anything, the burden is on the outlets to promote diversity (and hopefully in a way where the talent is also there).