Two things to bear in mind about this whole thing;
1) As has been said, Aus had plenty of overs at the last pair and couldn't get them.
2) 98 overs were planned for the day and 98 were bowled. The stalling for time didn't affect how many overs the Aussies were allowed, it just meant there would be no bonus overs.
The whole thing is just diverting from the fact that Aus should have won the Test pretty easily and didn't because they weren't quite good enough.