The person who did the actual testing would be better qualified than I am but I don't see how you are coming up with that torque figure. The testing looks useful to me for determining demand on a battery during flight but doesn't necessarily translate into torque requirements. I know there are some known loads applied and current measured but, while I am not 100% positive, I imagine it gets a little more complicated than that. I've done a lot of current monitoring and other tests on electric forklift trucks and it never turns out as simple as it seems on the surface.

Sounds like a good project too me... devise a way to measure actual force required to move a control surface and hold it there on various airplanes at various speeds using various linkage geometry, etc. Maybe in a wind tunnel? Then test various servos in the application and see how they compare?

There's a lot of things in this hobby (and the world in general) just accepted as fact. Most likely is true but I'm sure some of it may turn out to be a little different if actually put to the test.