Aw heck, I struggle with the explanation myself!
The statement isn't entirely innacurate, but the perspective is misleading.
The simplest way to put it, is that a higher flow rate will reduce the thermal resistance, i.e. the ability of the water/coolant to pick up or drop-off heat. So wether it's a waterblock or a radiator, it doesn't matter: more flow is better.
Seen in that light, it also should become more obvious that flow is far, far more critical in the waterblock than in the rad, because the heat source is a lot more concentrated in a block, where in a rad/heatercore, the surface area is relatively huge!
There is a balance point between the rad releasing the heat, and the block putting it in the coolant, but as stated above, the radiator is not the worry point, the waterblock is, and by far!
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