That’s because they were in quarantine. My husband was one of those and spent 6 days in quarantine before testing negative and being released. I was deemed a close contact and was tested every two days until 48 hours after his negative test. On days medical center didn’t test, I did self test … so nine negative tests in all. We were very careful … wore masks on embarkation and in transit day in Ft Lauderdale, ate in Club Orange (smaller dining venue ), no pool areas, avoided elevators and no large bus tours. Triple boosted. Still got Covid … and there were others. We knew and accepted the risks of travel these days