That was surely once true, decades ago, but they long ago jumped the postmodern shark and now are largely just calling anyone to the right of Bernie Sanders a nazi. The folks, sorry I mean "folx" running it now are not trying to track extremist groups, they are documenting anyone who isn't down for the omnicause, anyone who has questions about the revolution.
Once upon a time, a political group who kept public enemy lists (SLPC "hate map) would have been seen as extremist, something not done in a pluralist democracy. Today it's standard operating procedure for critical social justice activism. If you've ever used your own eyes, looked in your pants and concluded that humans are sexually dimorphic, you're probably on the hate map.