Does This Debunk the "Coolant Can Flow Through the Radiator Too Fast" Idea???

I do this with any new driver/project. Fire it up and let it just sit and idle for 15 or 20 minutes or so. I have a real temp mechanical gauge. Check temp., now drive it down the road 10 miles and watch the gauge. I have done with all kinds of old Mopars and such, with all kinds of stats and without stats. If no stat yea I can add one, but if it runs too hot, I say 95% of the time, its not the stat! or lack of one.

People always ask, why does my old car run hot???? How many times is because the engine block was full of rust and c*** and thus all that got into the radiator.

Whats wrong with my car. Runs like c***. Ever clean the gas tank and filter and thus carb??