They were only missing Starc and Cummins while Hazlewood, Zampa etc played which is why they were only missing a couple of their regular bowlers. All of their key batsmen were playing though.
I doubt it would have made a difference even if Starc and Cummins played since their batsmen collapsed like dominoes primarily thanks to Maharaj.
Something is really wrong with the Australian batsmen nowadays. And I am noticing this for the last 6 months or so, across all the formats. Jake Fraser McGurk became a gigantic flop, and the much talked Travis Head is not scoring runs nowadays. Mitchell Marsh is the only one with some sort of consistency, and he made 88 during the last match as well. Why Marnus Labuschagne and Cameroon Green are even included in the squad? Labuschagne is in poor form for quite long time. In case of Green, he is not even bowling nowadays.