I disagree and you are blowing this way out of proportion with your hyperbolic rant. For one, they are not in the US from what I can tell by the accents in the video and the location listed on the OP's profile page so OSHA standards don't apply...they also don't apply to autonomous individuals and groups engaging in a recreation activity. There are however, just like in diving, some generally accepted safety measures that folks engaging in climbing and abseiling should employ to avert the possibility of serious injury or death. Descending on a line with a heavy load on one's back is a practice considered best to avoid if possible throughout the mountaineering and rock climbing community worldwide. Based on the OP's statements in the video they had never abseiled before....the safety suggestion was just something they should think about/consider should they ever be in that situation again. And I agree with the suggestion by
@Scared Silly, that it would have been better (more safe) for them to have lowered their equipment before descending. It is only fun if you and/or your companions avoid injury or death. Once things go toes up the fun tends to screech to a halt...with a little bit of knowledge and exercise of prudent judgment and technique it is possible to avoid problems that would lead to the fun stopping.
-Z