Glock’s are prone to this and can't handle limp wristing
I dont think its limp wristing specifically, but how the shooter is holding the gun and what they do when it fires that causes the issue.
Ive tried to make a couple of my Glocks fail to function with a limp wrist/grip, and was unsuccessful when the gun was held "normally" in the hand, with the wrist "behind" the gun. Even with a bent, and unsupporting elbow, the gun fired without issue. I shot 4 full mags, 68 rounds, without a single stoppage. I was using basically a "no grip" hold when I shot them. The gun was simply resting on the web of my hand, and the trigger guard on the top of my middle finger. The only thing keeping the gun from leaving my hand when fired, was my finger in the trigger.
Interesting enough, the Colt Commander I was using as a sort of control, failed to fire a number of times with the same "grip", because the grip safety was not fully engaged. I had to keep shifting the gun in my grip to get it to shoot.
I did encounter a +/- 30% failure rate with the Glocks when I held the gun to the side by two fingers, like in the video, but it wasnt every round, like the video, and it really wasnt always one in three, more like, once in awhile. For the most part, the Glocks still functioned when shot that way, more than they didnt.
All the video shows, is that when held in a totally unrealistic grip, some guns might shoot every time, and some might not. Other than that, there is nothing there that shows any real world performance. If you add a "person" target to that mix, and add the hit record to it, you will find that the two finger hold just makes noise.
I did that very thing while doing my test, and when held normally, with no grip, and basically just point shooting, I still got "good" hits on the target. When I did the same with the two finger hold, I was lucky to hit anywhere on the paper, basically a 24"x40" piece of paper.