I take issue with this part of the report:
Since this type of geared engine will not continue rotating if power is lost (ie loss of fuel supply or ignition function will cause the unit to cease rotating whilst the aircraft is at any normal flight speed)
That is certainly not the case with my 912ULS powered Pioneer. It windmills readily and requires me to slow to about 40 kts to get it to stop when I'm doing realistic (engine-off) PFL's.