UF Pro has been posting some videos and this one is putting handgun disarm tactics.
There are several things to keep in mind. First, outcome of technique does depend on people engaged in this situation. One may have better training or natural ability, resulting in different outcome.
Second, the situations in video maybe not be a good representation. In the video, shooter knows there will be disarming techniques. If this is done for real, there is no telling when this will happen. Element of surprise may be favoring the 'hostage'.
That said, anyone who carries guns for defense should not scoff at something like this. There are times when you might be the shooter, and the other way around.