In ArgotIl est midi can indeed mean: too late, nothing doing. He was held on the Mont for several years. Waltzes and mazurkas, although becoming more popular, have not yet replaced them, because they are quite dull compared to the local dances that are full of movement, danced to the accompaniment of an accordion or, most often, a singing voice.
Without having to tell him explicitly, they make it clear that his request has not been granted. Perhaps short for Fiat in nomine Domini. Time is running out and we need you, Commissioner, to help encourage them to work on the preventative work on floods, so that we can build up flood defences.