Quote from2 things;
#1; Potential April's Fool joke, so it's not really what it claims to be.
#2; Modders tend to focus on a specific mod, a specific part of coding, while Notch has to handle EVERYTHING. Granted he's not alone, but there's not just coding to do, there's PR and all that crap too, also, real life. That is how "modders do a better job than notch".
It's easy to modify someone's game, it's a whole other world to build something from the ground up.
i have nothing against notch but EVERYTHING Notch says isn't possible to do a modder does in less than a week