Most likely nothing serious, but given their remote location, if they get unlucky and even one person needs hospital treatment beyond what's possible at the base, that's a big problem.
The issues they're not able to deal with tend to be slow burners. You might get a week to plan an evacuation or supply drop for a cancer patient. But with Covid Pneumonia not so much.
That's a great question. I wonder if they took a belt-and-braces approach — as well as all the quarantining and testing, bring along some remdesivir/molnupiravir/ritonavir/etc, monoclonal antibodies and so on, just in case you get really really unlucky and one of the (presumably quite fit and healthy) people ends up with a severe case.
It would very likely spread and infect more people. And by 'it' I mean awareness about how most of the measures are useless and that the vast majority of infections are benign.
