Cubfan, I don't see that the sentences you highlighted have anything to do with mooting anything. The first sentence just restates that a ball, including a grounder, that bounces fair and then goes foul before the bases and before being touched is a foul ball. The runners go back to their base and the batter hits again. The 2nd sentence implies that the ump should have yelled 'infield fly, if fair' and even if it hits foul and then bounces fair, it's still an infield fly and the batter is out.