Good Points. I have thought about other sources of error resulting in my "tracking test" resulting basically just another range practice session with questionable data. I was thinking the below two could be bigger sources of error on a 100 yard test.Checking out your own equipment is always better than reading someone else's results on the internets. The CATs target will work. There are others out there as well. I draft my own and could send you the PDF if you're interested.
As I've posted, I check tracking via static mounting and separate errors by each full revolution of the turret. As you get to the outer extents of travel, it is more likely that you will see an error. I prefer to put the error in context to understand the equipment's limitations better. When static mounting, you will typically see that a scope will Return to Zero even if the adjustment value is off or if there are dead spots, etc. The adjustment value will not vary depending on which rotational direction the mechanism is turning. This can also be seen in Cal's article that you posted.
Introducing recoil via living firing might show you if your optic has a zero retention problem. However, most shooters are unable to shoot well enough to determine if it's actually an error with the scope, or shooter, or ammo, or mounts - unless there is a significant problem. Additionally, the shooter error will also make it so that you will be unable to tell if your optic actually tracks correctly or is just kinda sorta close. Mechanically induced impulse loading and various mechanical stress testing is the only real option for professionals that actually perform testing for all the reasons I've previously posted.
Shooter Error
Using Factor Ammo and inconsistencies related to factory ammo
Heating of barrel (t3X lite and Christensen carbon)
Other Gun issues
Practice and data better than nothing? I do "rebuild/verify" my dope chart every range session at 200, 300, 400, and 500. trying to build my confidence with large temperature, humidity swings and confidence in these ballistic apps. I wonder if that is just better than doing a 1-off CAT chart test.