I wanted to touch on this..... I am kind of neutral on this. Agree if the reviver (whoever you are) has another one, keep quiet, but also, this is a VERY good way for wolves to find a player with an ability that is often (though not always) more village and thus make that player a bigger or more easier night kill target since simply by virtue of this "soft clearing" that player.... they automatically lean more village and thus wolves don't have a reason to let them stick around in the game.
So by keeping that player hidden as long as possible, later in the game when there are less players and that player is revealed you have a "soft cleared" player with less people around thus making (or hopefully making) wolves easier to find.
Just my take.