Flimsyfan - thanks for the video - what it does show clearly is that while he is talking about high RoD, he has over 10 degrees nose down.
Now that to me looks like a fudge - 10 degrees nose down will give you a high RoD in any helicopter and it would also mean that by the time you pulled power to try and recover, you already have enough forward speed not to be in VRS anyway.
He then pulls the nose up and, strangely enough, the RoD reduces rapidly with aft cyclic and power applied.
Definitely not convinced by that demo.