I wonder if the original quote / question refers to the sometimes sinking feeling one encopunters right at the bottom.
You know ~ Everything seems set up right, then - during the flare stage - whoosh downhill and pick it up with a quick collective flick- then one wonders s*^& what happened.
In my mind mostly I put it down to a sudden undetected wind shift, and thus losing effective lift, not incipient VRS.
During auto training I always demonstrate that it takes about three hundred feet of airspace to translate from full powered on flight - to stabilised autorotational flight. Therefore we don't hover below between three hundred feet and twenty feet, OK?
Of course with advanced training, as covered elsewhere, one can conduct a successful EOL from in between those heights given that a fair bit might be going for you, but you weren't stabilised in auto when doing it.