There are at least four possibilities of varying likelihood: 1. The cruise-line is trying to deflect doubt about their sanitation practices by throwing a dead

There are at least four possibilities of varying likelihood: 1. The cruise-line is trying to deflect doubt about their sanitation practices by throwing a dead guy under the ship. 2. The guy had something before he boarded but didn't realize it was COVID-19. 3. The guy knew he had COVID-19 and boarded anyhow. 4. The guy picked it up on the ship around the time that he boarded, plus or minus a few days.