We used to do this demo for kids when I taught rock climbing at a summer camp, but about 2" off the ground and over pads.
It's a great demonstration for teaching about how ropes are constructed and how we can trust the same fabric used to make pantyhose with high loads and our lives.
But jeez, that video was bananas. Reminded me of this
Ouch... now that video brings a shiver... not really the same as sharp objects in the fall path constitute a next level of risk. Did this rock climber survive?