Well I can tell you from personal experience.... Proven!!
I installed a set of these on my 2016 Dodge Challenger Scat Pack, installed one on the front and one one the rear did 6 laps at my local track then checked and compared to the other side with a digital temperature reader, found a drop of 32 degrees on the front and 19 degrees at the rear.
Yes I checked directly on the caliper itself and not on the cover.
I will agree that it will fluctuate from one vehicle to another, but again to the research I did and talking to other people that use them at my track we all came to the same conclusion.
I'm not here to argue or recirculate bad information as you so elegantly put it, I'm simply sharing my own experience and others I associate with on a daily basis.
Thanks for the basic physics class............