He is right, actually. A lower thermal resistance means very little at idle, when the wattage is really low. At a higher wattage, like overclocked and at load, let's say, a small thermal resistance difference becomes much, much larger. If processors put out 10 watts, then watercooling would only be ~0.8C (WW with a Procore, medium fan, 0.15C/W) better than aircooling (SLK 900A with a Tornado, 0.23C/W), but at 1000 watts, there's a difference of 80C.
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