This recovery technique has been proven to be working during official test flights for the Swiss CAA
Any data to support this? test configuration, aircraft type, AUM, IAS, RoD?
Seems strange that only the Swiss advocate this method or is it wider spread than that?
The CHC crash would not have been avoided using this technique - you have to recognise you are in VRS first. There were a whole lot of other factors which could have prevented it.