I am sure I could build a target that my desert eagle could drop but your 45 could not. Its all relative. Then we could do the same to prove that you need a 50 caliber bmg... metal plates do not mean much. I could throw a brick or even a baseball at that target where the 9mm failed and knock it down .... but I would rather have a 9mm. This demonstration seems to fail the common sense test, in other words, and I would not put too much faith into such a setup.
I really question people that make a demo like this, I think such things do more harm than good. It just confuses the issue.
In the end, its all compromise. Penetration, energy, momentum, gun size, .... blah blah something has to give, and each person has to pick from what is out there and what they can handle, conceal, etc. I would most like to have my 223 pistol if I have to get into a gunfight with a handgun. But its difficult to carry, so I probaly will not have it if something happens to me. Instead I will have something much smaller, lower cap, and shorter range.... thats just how it is for anyone not wanting to spend a lot of time talking to the police