If you can't control the variables and you can't measure them with any certainty then you will end up seeing whatever you want to see. I have a testbed that is about as good as one can have that is still "real world", but I would still prefer to eliminate the radiator from the equation and use something to provide a constant inlet temperature. Simulators are used in place of processors when people want to actually quantify the power (and heat) that is going into the system. That is really the only way to compare different heatsinks or blocks.
If you look at AMD's technical documents, they use die simulators that are very advanced (monitor heat in several places) and do not bother with socket probes to draw their conclusions. Why wouldn't you expect the same from an "expert" reviewer?
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