I think there was a change in the laws sometime after RWC 2007. Of what I am sure is that nowadays, after tackling someone you have to release them, allowing them time to place the ball, besides being on your feet, to be able to contest for it.
And that victory could have easily been a defeat had the Wallabies not missed so many kicking opportunities that weren't that hard. They ended the game with a fwd playing in the centres! Still barely lost.