Dark Enlightenment, Cathedral, etc are ideas. Probably bad ideas but, ideas. You battle bad ideas by showing them to be bad and showing ones that are better. You don't cower in fear or spread alarm.
We live in the age of the internet; a giant library with whole shelves (wings even) of material on scary ideas like The Dark Enlightenment, Racial Superiority, etc. These ideas aren't going away. It's basically impossible to ban motivated people from discussing ideas because of encryption technology. All a ban will do is give a weapon to suppress ideas to the vast silent majority who see little value in defending ideas others have told them are bad.
If the author of this article has a problem with these ideas, then say so or at the very least point out links to refute them. Breathlessly implying they are intrinsically wrong does nothing but signal virtue to those who don't find the topic worth investigating deeper.