Yeah, that banner is bullshit - as far as I can see it is completely ignored by the majority of people supporting gamergate.
The linked thread on reddit is full of people complaining about "SJW" - social justice warriors. These are equated with feminists and are widely condemned by GamerGaters.
Attacks on women in gaming dominate the headlines on the linked subreddit[1], and it's pretty clear that problems they have "biased and corrupt" all revolve around the reporting of women in gaming.
Perhaps there is a problem with biased and corrupt game reporting. I wouldn't know, but as far as I can see #gamergate is just using it as an excuse for misogynistic behaviour.