There is an old thread on here that I have posted links to the videos etc that you may want to look at BDL. CM does use check chains, e collars, prongs & dominant dog collars.
Dominant dog collars basically strangle the dog. Literally choke the air out of them when the trainer lifts the dog off it's feet (CM does this a LOT).
CM is worse than the guy you've shown because he continues to correct AFTER the dog has ceased the behaviour or has complied with his direction.