Yep, I read that one. He also gives more detail about how exactly someone is considered "reputable" here:
Discussion
I agree with Miljan’s point. It’s probably 80/20 lurkers/participants. This definitely cuts out the lurkers (who are also real). Maybe interactive follows would make more sense than reputable
True, but lurkers aren't posting anything to be unfairly filtered out, otherwise they're not lurkers.