Concealing would, to a large degree, negate this danger. Not eliminate it, but reduce it.
However, your point is taken.
Not to be harsh, it make no sense to have a nice revolver like that in a cheap holster. Defending yourself doesn't usually consist at 20 paces at high noon. Therefore you may be attacked in close quarters. I wouldn't trust that holster in that situation for reasons seen in the video. Feel free to ask the instructors on this site their experiences with them. They know a heckuva lot more than myself about self defense.