Total bullshit. The CX crew didn't do anything wrong. They were exempted from quarantine and it was legal for them to leave. The three day home quarantine was just CX policy. Nobody at CX signed up to sacrifice their ways of life and their jobs to "protect" a bunch of 80 year olds with an entitlement problem.
You are right, that would be totally avoidable by getting the vaccine, preferably the one that works. People who haven't gotten vaccinated by now don't deserve any better.