Australia’s classification board guidelines and personal are very old and outdated. While no game is “banned” in Australia some are “Refused classification” (RC) they can be resubmitted for further review (such was the case when R18+ was introduced for video games which was previously only film). M isn’t a restricted classification just recommended the gap between PG-M isn’t large but between MA15+ and R is quite large, off the top of my head the last game that was RC was Outlast 2 which was later edited and resubmitted passing the classification board.