Not really sure what you're getting at. As you know, lenses leave the factory within certain tolerances. Also, camera bodies leave the factory with certain tolerances. If your lens is at one end of the tolerance spectrum, and your body is at the other, that lens and camera combination will be way out of whack. Likewise, if they both happen to be at the same end of the spectrum, they will be spot on. So it really isn't a 'lens' issue. It's a combination of that particular lens and that particular camera body. +6 or -6 on the MFA is no big deal quite frankly (IMO).
Also, in your video, and the text below, where did you get the test distances from? Canon, LensAlign, and other focus calibration parties recommend 50x to 100x the focal length being checked/tested. So in the case of the 24-70mm it should be checked at 50 x 24mm which is 1200mm, or 47.244 inches (4 feet), and at the 70mm end around 11.5 feet. Ideally, they say the lens should be MFA'd at the distance you most frequently use it (but who the heck knows what that's going to be!).