Australia were never going to withdraw their appeal over the stumping, because it was something they actively performed. They’d spotted that Bairstow tended to end his over before it had been officially called and they took advantage of the fact. It’s unsportsmanlike — if they had a problem with his behaviour, they should just have requested that he stopped It. It’s really not the spirit of the game that you find some loophole to get somebody out despite no actual skill being involved.