It looks like the pilot was a passenger in this accident. This was an avoidable accident and very, very sad.
The failed attach point shows classic fatigue cracking followed by brittle fracture. I would like to think that this crack was detectable when the inspection was done 120 flight hours earlier. In fact I'm a little surprised it wouldn't have been visible to the naked eye or with simple dye penetrant. I hope CASA's specification of eddy current detection vs the manufacturers recommended magnetic particle inspection gets proper scrutiny.
I don't understand the overload concessions either. The original (radial engine) airframe is rated by the manufacturer for a MTOW of 5,300 kg in "overload operations". Without some sort of mechanical strength augmentation I don't understand how this can be extended by CASA to 6,600 kg., especially since operation at those weights for firefighting by definition involves operation in turbulent air and with significant aircraft manoeuvring.