This is a pretty ridiculous series of statements, especially if you count YC as a mid-stage startup when he joined (which it was).
If you add up all of the successful YC companies since he started leading YC, it's a pretty breathtaking number (the count, the valuations, and the value created). YC was having pretty serious scaling problems when he took the reins-- from my understanding, he resolved those pretty effectively. YC's growth since he's been leading it (in a lot of directions) has been impressive-- full-stop.
If you add up all of the successful YC companies since he started leading YC, it's a pretty breathtaking number (the count, the valuations, and the value created). YC was having pretty serious scaling problems when he took the reins-- from my understanding, he resolved those pretty effectively. YC's growth since he's been leading it (in a lot of directions) has been impressive-- full-stop.