If you look at the stats, it is understandable.
Qantas is a small airline in world terms.
The return destination environment ( Aust) is benign . Their network is not as extensive nor their routes as diverse as big airlines.
Compare QF with airlines that have 5 or 6 X the fleet and network with many more operations and many of those in more severe environments.
Apart from trying to go cheap on some maintenance and trying to blame the companies they chose and supposedly supervised and, some recent take off performance issues, QF has done well.
Doubtless, Qantas's safety record ( in the jet age)is enviable , especially since they stopped playing golf with their aircraft.