I don't think the fact that communities like this still exist is a point against them. They state in the article that they are also involved in communities they would consider "old internet" using modern tools.
I think their thesis was that as a whole the internet has become a more shit experience for the people using it. If you sampled 1000 random internet users decades ago they would have an experience closer to yours, if you did the same today I think it would be a lot "shittier"(to a lot of internet ysers, Facebook/twitter is "the internet")
I think their thesis was that as a whole the internet has become a more shit experience for the people using it. If you sampled 1000 random internet users decades ago they would have an experience closer to yours, if you did the same today I think it would be a lot "shittier"(to a lot of internet ysers, Facebook/twitter is "the internet")