He named it, so is ever so slightly wrong - but all of us who have been around for a while and have participated semi-regularly in discussions without getting banned are in. Relative to the global online population this is still a very small group.
You could identify a set of people who are widely respected and listened to, but that's a different thing again from what Lewis is talking about. YC itself is arguably closer, but only tenuously connected in practice to HN social dynamics. I certainly couldn't tell you which members I pay attention to have been through YC (except for the ones who definitely haven't).