This study was focused on the US egg export market, so they were looking at moisture loss, which affects how "fresh" an egg looks and tastes, but they did not look at the rate that eggs go bad. Egg exporters don't sell rotten eggs -- that's the consumer's problem -- so that fell outside the scope of the study.

The theory is that sanitizing process makes the shell more permeable, which makes it easier for random bacteria in the environment to infect the egg; thus it risks going rotten faster. Refrigeration slows down the growth of these microbes, thus counteracting the increase in permability.