That looked very much like how I recall my QHI's very lame demo of "vortex ring" in a Whirlwind almost forty years ago, up around 10,000 feet.
"There, vortex ring!" he said, "Did you see that?"
"Er, no".. said I, honestly.
"Well that's all you're seeing", he said. and that was it, end of demo.
Nothing like what FDVRS really looked like when I saw it some years later!
The demos remind me of "stall recovery at the incipient stage" in a fixed wing. Just lower the nose slightly and fly away, easy and rapid recovery because it's not a fully developed stall.
Sorry, not convinced at all by that video but in fairness, just like a fixed wing stall, the incipient stage is the best time to recover (if you can do so).