I believe the point of the post was to hear what he is hearing in his personal ear monitors...click track, audible reminder and count before singing begins and vocal track to 'mime' over. You hear 2 Paul's because one is what the crowd hears, the other is what he hears so he can match the track, omitting his live mic to the PA.

In that sense, he is not miming, he is 'singing' along to the recorded track so as to not make mistakes but albeit it is miming on some levels, he is still doing it alongside the track....some wouldn't bother a peep coming out of their mouths