The point of the video was that when shock loaded the Daisy Chain loops will fail and if not twisted properly, you will die. Use a second locking biner, was the second point to prevent death, from this easily made mistake. That is from the manufacturer.
You may look at the video long enough and come up with an alternate theory for the origin of species, solving global cooling, prevent famine or anything else your imagination could conjure. But you could do that from the safety of your couch where ignoring the obvious is less deadly.
Sent from my iPhone so seemingly inexplicable spelling and syntax errors are probable.