Just checked and you do still need to go to court if a child is in care of the state, as ruled in Re: Kelvin.
Please note that you may still need Court authorisation in the following circumstances:
•There is a genuine dispute between parents, or people who have parental responsibility for a child, as to whether treatment should proceed
•There is a dispute between the child and / or their parents and medical staff as to whether treatment should proceed
•There is a genuine dispute between the child and their parents as to whether treatment should proceed (if the child is not competent)
•If a child is under the protection of a state welfare authority.
justiceconnect.org.au/re-kelvin-a-big-win-for-stage-2-access/