You can use this fact to see deleted messages on whatsapp. Just enable the notificaion history and Now whenver someones sends you somethign regrettable and deletes it you can still see it in notif history. The reason you need the notif history is whatsapp actually live wipes the notifictions for deleted messages.

Starting from Android 11 (2020 ish), so not even that old

Where is this? I never saw that feature