Oh yeah I remember that quote all too well. He conveniently and purposely ignored the observable 10x modifier players experience in old raids, and simply chalked it up to the natural power difference from ilvls between expansions. I quoted that in an old complaining thread from almost two full years ago:
I noticed a distinct lack of power increase after coming back for the prepatch event and getting a number of characters between 480-490 ilvl. The fact this is still an issue just blows my mind.