Well I've done some testing too and it is very true. First off, if you run a larger pump and restrict the flow, the pump will run warmer and can transmit more heat into the outlet flow than if it runs at unrestricted flow.
If you don't have a small fan to cool the pump, it can run 28C or higher in 21C ambient. If you use a 22CFM fan to cool the pump, you can reduce the pump temp to 25.6C. My outlet versus inlet temp is only .4C higher like this.
If I restrict any flow from the pump, my Dig Doc5 sensor touching the CPU core goes up within seconds, release the restriction and it goes back down.
As I stated, reducing flow causes temps to go up 1 to 2C with the same system, same overclock, same load, same pump in the same controlled ambient conditions, so it is very true.
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