I did not assume anything regarding the EHAS like form...I just mentioned it....and I found an explanation that was in the link posted previously ...no exposure to anyone on Island thus no need for repeat testing

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Limited Shore Excursions
At the various stops, Celebrity will be offering what they are calling “curated tours.” This is in line with what various lines have been discussing with regards to keeping guests within a protective bubble in order to avoid contaminants being brought back to the ship.

In an interesting twist on this concept, Celebrity will also be offering what they are calling Private Journeys and Small Group Discovery Tours which are described as being “for those guests preferring to explore the destinations with only members of their family or traveling companions.”