There is still the opt-in Communication Safety {3} that tries to interdict sending or receiving media containing nudity if enabled, but Apple doesn’t get notified of any hits (and assuming I’m reading it right the parent doesn’t even get a notification unless the child sends one!).
1: https://archive.ph/x6z0K (WIRED article)
2: https://support.apple.com/en-us/102651 (Adv Data Protection)
3: https://support.apple.com/en-us/105069 (Comm Safety)