He does not say a 30-06 will not kill a Whitetail, only that it is harder to hit a deer at extended range with the slower bullet. I choose the 300win over the 30-06 just as many choose the 30-06 over the 30-30. Just because my caliber of choice has "magnum" in it's name does that somehow make me some kind of deviant. This is the same old argument between compound bow and stick bow users, musket users and inline muzzle loader users and standard caliber rifle users and magnum caliber rifle users that goes on and on. I have killed big game with calibers from .243 to 375H&H.
How about we live and let live.