Unification is a great word, and I think it is pretty representative of how Apple is trying to forge ahead. However, the fact remains that today, the way that iOS and OS X are converging is by OS X taking lots of cues from iOS, and not so much the other way around. Call it iOS-ification, unification, or whatever else you want.
He hits the nail; it’s a semantic issue, really. Calling iPads “PC”s should probably relegated by the same fallacy.