I like that quote.

Speaking of me....
Fools jump in where Angels fear to tread.

So i humbly submit the “modest” idea
that this heat transfer versus coolant flow argument
could be clarified by driving a manual transmission vehicle up and down a steady steep grade in each gear.
This would give data at different rpms and heat loads.
Even with an automatic trans there are various ways to “hold a gear.”

On downhill drives down a 4% grade you can go 60+ mph speeds with zero horsepower from the engine.

Many approaches to river bridges in hilly country are 4% grades.

Another good quote:

If you torture the data long enough it will confess to anything.