Even if you include the first four seasons, that's roughly 45 teams out of over 210. That's a little over 20%. If you were to just count the seasons post 4, it'd be 21/166. Roughly 12%. I'd consider both counts as elite. So congratulations Art & JJ.
Edit: Nevermind, I just now watched the clip of them saying that. You're right, apskip, but I think it was just a spur of the moment statement from them.