Is that still the case?
Flagging hides the post immediately?
Reason for asking:
I just used flag to suggested splitting a topic, before I discovered this advice.
But I still see the post I flagged (my own post).
If flagging really does hide, then, in future -- okay -- for non-problem posts, will notify a mod.
Else, if flagging does not hide, then flagging is easiest for ordinary users, because we don't need to search for whom to notify or send private messages.