http://www.thestar.com/Sports/article/255769

Basically his claim is that the typical Moneyball draftee, an unathletic guy with a high OBP, is the kind of guy most likely to take steroids because to them, steroids would be the difference between making it to the show (and major league minimum salary) and not (and minor league minimum salary), and that steroid testing has eliminated those players from the field.
In other words, he doesn't understand Moneyball, makes false assumptions about the typical Moneyball draftee (who is, by definition, someone good enough to draft but that everyone else is ignoring for some stupid reason), and uses that false predicate to criticize Billy Beane, who knows more about baseball than Richard Griffin and has used it to run a baseball team successfully for years. Thanks for playing, Rich.