Just watched the highlights. That last Aussie try should have been no try, touch-in-goal.
[TEXTAREA]22.12 BALL OR PLAYER TOUCHING A FLAG OR FLAG (CORNER) POST
If the ball or a player carrying the ball touches a flag or a flag (corner) post at the
intersection of the touch-in-goal lines and the goal lines or at the intersection of the touchin-
goal lines and the dead ball lines without otherwise being in touch or touch-in-goal the
ball is not out of play
unless it is first grounded against a flag post.[/TEXTAREA]
That last bit is exactly what happened. The ball was grounded on the goal-line, against the touch-in-goal flag post.
https://youtu.be/DLjLt2K3yuo?t=726