Hmmm... OK. I mean, if you get the notice that it's been addressed, then that does suggest or indicate the mod has either taken action or chosen not to.

Pretty sure its a judghment call. The mod has a lot of personal discretion as to whether he/she thinks a particular action should be taken: i.e. removal of duplicates - evaluating just how duplicate are they?

I think that the mod team have general outlines and guidelines in place, but there is a LOT of individual discretionary action. But don't quote me on that.