I flew the Firefly extensively as a civil FI following time as a tp. This was in the days when students were given realistic instruction in unusual attitude recovery. I have lost count of the number of times that my students were capable of recovering from the most extreme flight conditions (with the exception of inverted spinning - expressly banned by the release to service). In no case did I ever experience any problems or delay in the aircraft being returned to a normal flying attitude and IAS when traditional and correct handling measures were used. I believe it unlikely that two Tucano QFIs would have mishandled the machine to destruction.
p.s. I am also familiar with the Tucano as I did the initial trials before it was selected.