Not in those strict words but he does put his hand up to show that in the video of his you linked two posts up, and I have described it that way on this forum as well.
Your particular issue with it is the exact reason I tried to push for a more descriptive approach of the actual muscles used to do these motions. It’s one thing to describe what it looks like in broad terms, but another thing to describe what it should feel like when you are doing it correctly and the muscles engaged in making it happen. If you were to use the same muscles as turning a key, or doorknob, the motion becomes too broad and don’t see that working well for many. Although Eddy Van Halen’s tremolo picking may one notable exception,
The same concept that a personal trainer might do in a gym to ensure you are engaging the correct muscles for each exercise in order to work the correct muscle and get a more effective workout.