Glad that you seem to have better knowledge than the AAIB - they seem to think it existed and so did we 89-95 - BAOR / NI / Op Granby
Yes the same information was widespread in the UK Mil and I was flying the Gazelle at Shawbury during that period but was never convinced about the theory.
The whole construct of Fenestron Stall was demolished when Aerospatiale demonstrated recovery from in excess of 120 deg/sec left yaw with full right pedal and it stopped perfectly (albeit with the little red Tq light flashing).
It was later understood that Fenestrons have different handling characteristics to conventional TRs and need prompt and sometimes large pedal movements to control undemanded yaw where the pilot has got behind the curve regarding actual pedal position compared with required pedal position,