Not a bad concept, but execution was not great (pun intended). In part it is because 9mm times 20 does not equal 180 mm. Based on looking at the impacts on the first hog, it looks like he shot about a 4 foot group at what, 20 yards, so roughly a 240 MOA group which isn't good at all. Fortunately, it was a small hog and at least one shot managed to hit it.
With the second, he appeared to walked the shots across the hog, the first bullets impacting several feet in front of the hog.
So while full auto is a neat concept, he chose to try it with a gun he could not aim well or control well.
Not so much in his control was the dust factor, which was unfortunate because it ruined being able to see a lot of what was going on.