The TSX bullets are one of the best. My friend used 180 grainers this past fall in his 30-06 on a moose hunt we were on and he shot a nice bull high shoulder and dropped it where it stood.
You're right, even though the TSX is a great bullet there is absolutely no need to use them on whitetails. The corelokts and interlocks are all you need. That dude was just blowing smoke.