Yeah Big Splash is closed this summer, since it was last sold they haven't kept up the maintenance as @themagician said.
While they did write to the local government saying that they would reopen after repairs have been competed I will believe it when I see it. I can definitely see sometime next winter that it will quietly be announced that the required maintenance and repairs is just not cost effective and Canberra will lose another summer activity. Canberra currently has 5 outdoor pools, Big Splash being closed brings it down to 4, Phillip pool has also been announced as going as part of another apartment development so we'll have 3 outdoor pools left, 1 of which is very old and not very big