We don't know what Cory does all day. We know he has a family, I think he has a kid, that means that he has responsibilities that don't involve blogging. For all we know, at the end of the day he curls up with a dead tree book and unplugs to relax. He might not be as online as his overall style might make him appear and we don't know what all circles of people he runs with, so it's entirely possible that he just heard about it.