An acquaintance lost their partner in an air accident. Their experience of CASA and the ATSB afterwards was less than stellar. The agencies fastened on a politically advantageous (or least damaging) interpretation of events and fitted their analysis to the desired outcome. You cannot trust a word they say.
A bit of advice: do not carry your logbook while flying, or carry it and send images and take images of your maintenance release before every flight and send them somewhere. Same with fuel dockets. That prevents ATSB from speculating about your flying and the state of the aircraft.