I find the wording abundantly clear. The recommendation has more to do with avoiding last minute hiccups and delays, not the need for a test to be performed under medical supervision.
Based on current European Union Healthy Gateways (EUHG) guidelines, to board the ship, all guests ages five years and above will require a medically observed, negative viral COVID-19 test (PCR or antigen) result taken within three days of embarkation. These protocols are subject to change and we’ll communicate any updates as they become available.