QF domestic flights are all planned with a minimum of 70 minutes over destination, plus whatever dispatch or the crew deem necessary on top of that.
It’d be interesting to know the facts of what happened here, but of course the absence of said facts should be no barrier to speculation and condemnation…
(For joker89, there’s no such thing as declaring a pan for fuel. As morno alludes to, there’s ‘minimum fuel’ and then ‘mayday fuel’. Do we know for sure that ‘minimum fuel’ wasn’t declared?)