Because the only banns that are announced or posted are for the favored ones, that is, those with money or the ones in power. Many, many marriages have been performed there without banns announced. Very few ordinary ones get posted or announced. I always thought the banns were a requirement. Aren't they? Not in Perezlandia it seems.
Your priest didn't leave, he was told to leave because he joined or went over to the Old Catholics; least that's what Perez told his sheeple from the pulpit.
btw, doesn't that huge picture of Divine Mercy bother you?