Certainly I am no aeronautical scientist, nor engineer. As an open minded Instructor & professional Commercial Pilot I wanted to try for myself & if proven effective adopt this technique for myself. So I have tried the Vuichard technique in the real World; practically many, many times in both a piston (at <5,000,) & turbine machines (> 10,000') & found this technique does NOT work when in full blown VRS with ROD above 3,000' ~ VSI firmly pegged @ 3,000'? In mild SWP & IVRS yes, it does work, OK!
Remember You get into VRS because of a high ROD, power on & zero airspeed, so the priority (for me) get back some airspeed by poling forward....VRS problem solved
So I will surely be sticking to the tried & proven method taught to me & I am assuming the vast majority of Pilot's here.
Happy Landings!