While your probably trying to diss Ron Dishman. You should realize this is a very good and proper teaching technique for someone who has issues with shooting a firearm and is anticipating recoil.Ron Dishman is going to start trying to teach people on how too fire a BB gun.
I usually prefer to go down to a 22lr if possible, but I have had students where it was necessary to go to the BB/pellet gun (if needed) for them to master proper safety, technique, and trigger control. And then moving them to a larger caliber when ready.
The students ability/needs comes first, not their or their instructors ego.