That was the old school argument, verbatim. The new school disagrees. I don't really have an opinion but I'm pretty certain Nate agrees with the new school and would disagree strongly with your view.
The new school argument is something like: the Triple Crown is an overvalued and superficial accomplishment and giving a player the MVP based solely on that is making a similar error to the scenes in Moneyball where the scouts cared about irrelevant things like whether a player has an attractive girlfriend or how he gets on base (walks vs hits).