Nine’s MA classification for this also included “violence” (despite the Classification Board only deeming the violence as M-level), along with “sex” and “language” which the CB did have at an MA-level
While it does happen, it’s rare, that both the CB and broadcasters, list consumer advice despite it being at a lower-level than said classification and technically not contributing to it. Usually done as a pure extra advisory, whereby it may be of value for viewers/parents/guardians to know such content also exists, most likely for a particular reason (scene).
See here: