No. APS just make it up. Based on their amateur intuition. They do not have access to the most sophisticated piston aero engine test cell on the planet and they do not show videos of the actual measurements taken in that cell during a real engine run in which fundamental variables like timing and mixture are varied. And even if they did show those videos, the measurements would be faked because - well, what interest would they have revealing the real measurements.
Alas, I think my first call was the correct one.