If I understand OP correctly, confessions are to be reported to the authorities, not accusations. It's good to see that the Australian Labor Party is mandating common sense limitations on the clergy-penitent privilege. This same issue is being litigated in the United States.
However, how many cases of this nature come to light as the result of an abuser's confession? In the cases involving JWs, it is the action of an accuser, not a confessor that brings the situation to light, as far as I know.
Once it is clearly understood by all that child abuse is a crime, then religion can step aside and let law enforcement and the courts investigate accusations and prosecute. If a religion wants to take measures to rehabilitate the sinner (including false accusers) that's fine; but not before the proper authorities are called upon.