Well, the video in the link is gone; something about a terms-of-service violation. As BBI and Hambo indicated, more shots fired into the same anatomical location will not, necessarily, produce quicker incapacitation. Bigger-diameter bullets will not, necessarily, produce quicker incapacitation, It may be necessary to place subsequent shots in different places, in order to disable important bits other than the “center of mass.” We may well have to use footwork, to get off the line of attack. And/Or, we may have to provide physical “assistance,” at contact distance, to help the person go down, or redirect his motion(s).
Nothing wrong with having larger-capacity mags, but if one or two shots shots do not work, a mag dump, in the exact same place, may not hasten incapacitation.
Nothing wrong with bigger bullets, but, depending upon shot placement, the permanent wound channel(s) may not be larger enough to make a difference in incapacitation times.
I remember a blade-fighting seminar, about 2004, more or less, being taught by Steve Tarani, during which Steve recounted asking one of his prior instructors about a drill, that involved a decapitating cut being immediately followed by a cut to the opponent’s sword hand. Steve’s instructor replied with a statement to the effect that even a just-decapitated enemy can still be a deadly danger, for some amount of time. (My memory has faded, but the instructor was a Filipino guerrilla, during WW2, who had subsequently become a highly-respected martial arts master.) So, yes, a drill that emphasized the need to literally disarm an opponent’s weapon hand, after a decapitating cut. THAT is a failure drill!
I did not continue in regular blade training, but seriously dabbling in it, from time to time, does teach one the need for footwork, and to assume that every cut or thrust may well fail. The principle applies to gunfighting, too.
Edited to add: Everything on Page 2 was posted while I had already started typing this post, so I had not yet seen the video clip posted my LL.