Yeah, this article feels like either a straight up dogwhistle to let gaters know The Escapist is still for them or just clickbait to let people know The Escapist somehow exists still.
The Wikipedia page is heavily moderated and unbiased. As are most sources on the issue but to sum it up simply it is/was a harrassment campaign primarily initially targeting a developer called Zoe Quinn because her ex made some false accusations about her. It then evolved to target more women, minorities and in particular the LGBT community in the games industry. At some point they tried to claim they were actually complaining about ethics in games journalism and invented some conspiracy theories that they claimed supported this notion. These had no basis in reality and were just another cover for people harassing women and minorities in the industry.I have to admit, I really don't understand Gamer Gate. I only became interested in the 'industry' and not just games in 2013 and it's still super difficult to find solid (non-biased) info on the subject.