I think it does matter! Why wouldn't you want to know if you negative or positive for sure?? So you don't bother to take a covid test and show a fake test. Turns out your kid is positive, once you're on the ship. We know the result of that, you get quarantined to your room for a good part of your vacation. Not to mention possibly infecting other passengers, who in turn get quarantined to their room too. I think that is irresponsible advice!