Any discussion about >3000fpm sink rates and whether you call it incipient VRS or whatever is not really the point. The point is when you come in at e.g. 500 fpm and then you pull collective at 100ft agl just to figure out your descent rate goes the other way. Before you reach a >3000fpm sink rate, you'll have crashed.
Interesting to see how stubbornly some people rebuke this as utter nonsense. If that was the case, they certainly wouldnt teach it at the Robinson safety course. Try it out for yourself, talk is cheap.