Sounds like you are suggesting a slower water pump & lower airflow will increase cooling? If so, that's plain wrong.
Faster water coolant flow & faster airflow will increase cooling on a vehicle.
I will leave it for somebody else to explain your error & I hope you understand.
Well, both of you are only conditionally correct and that condition depends on where that velocity, volume and density ( of both the coolant and air) are relative to the amount of heat to be removed and total area of exchange.
Many people think this is a simple linear equation but that's not even close.
Given the coolant properties ( viscosity, Sg, chemistry, system volume, additives etc.) and the amount of energy (heat to be removed) there is a necessary soak time for the transfer (fluid dwell) and there is always an upper thermal transfer limit before changes of state start.
Optimum velocity is calculated between those 2 for the amount of heat to be removed. It can be too fast or too slow.
On the air side, ideally you want dense cool air on the front absorbing heat and increasing velocity on the exit side.
But as with the coolant, there's a point where velocity will create dead air pockets over fins and tubes which will act as insulators like an airfoil. That velocity negative transfer effect can be worsened if air cannot evacuate faster than the feed, if the forcing cone doesn't cover the entire transferring surface ( shroud issues) or if there is a significant approach angle issue.
There's just a lot more to successful heat removal than just buying a big tank and a fast pump.