I have to agree with this method.
I realize that if the rider is actually injured you need to call paramedics, but in most cases, unless the rider has seriously broken something or is missing body parts who is really going to call 911???
Unless I am dying, I will kick my friends a$$es if they call 911 because around here, if the cops show up you are automatically at fault, stupid, reckless, getting some kinda ticket and getting screwed by the whole system.
So, all the accidents we have participated in have gone pretty much like this: Rider goes down, we all stop, someone makes sure riders body is stable, rider is not allowed to move until we check'em out, we check entire body for injuries more than once, check for finger/toe feeling, broken bones, etc., only after we have reassured ourselves and the rider there is NO INJURY we then proceed with removing the helmet pretty much as shown in the vid, except slower for less movement. Even if the rider thinks they are uninjured, we dont allow them to remove the helmet, we do it so the neck and head are stabilized at all times. Only then do we get the rider up and moving and start picking up the pieces.
Obviously however, if there is injury of the type requiring paramedics, we would not remove the helmet.