The article goes into a lot more, but the feeling is that this is different because unlike previous indoctrination waves, GG started very young for some kids, and is constantly reinforceable thanks to social media ubiquity. A religious objection in the old days was teachable because in most cases a kid in college was breaking away from parents and the community they grew up in. You had a chance of educating against it. With kids that grow up on a steady diet of Gamergate, anything you teach is instantly torn down by a million YT videos or Twitter telling them otherwise. Weaponized online harassment featuring heavily in that.
None of that is unique to GG. It’s just the dividing point between before and now.