During this time of the year, when new itineraries are about to come out, you may have some temporary issues accessing new itineraries and there could be corrections done as well after they are released.
It was never about proof, but the OP's worry about how to handle the situation should it come up. You could have had "rogue" agents pulling you for secondary medical screening even before COVID. As with my first post, assuming you aren't truly very sick, just say no to all the health questions, if asked.
Lots of things affect sat based internet - the position of the antennae is not likely to make any diff with the undisturbed view of the sky from a ship.