Under the heading of "Your Mileage May Vary" this is a very dangerous video. Regardless of what happened in their testing, it is dangerous and life threatening. I would not want to be associated with this type of claim, regardless of his disclaimer at the beginning.
In our club supplies for Hunter Education and Firearm Safety, we have several barrels destroyed by obstructions. One is from an 870, and the obstruction that blew it wide open for eight inches starting at the breech was a spider's nest. We have one that was a 20 ga in front of a 12 gauge, and it took over half of the barrel off at the mid section and blew the magazine tube completely off the gun.
As gun guys, sorry Red and M'ette but you are just two of the guys, we are a weird bunch. On one thread we will rip someone a new hole for slightly increasing a powder charge, then in another we will down play barrels obstructed by another live load. We will promote and claim to carry and be ready in a thousand different ways, and then we will go all Sarah Brady when another gun person does not live 125% by firearm safety rules in handling and storage.