It is an appropriate use of statistics regardless. The main thrust of headsoup's argument was that the focus on unvaxxed people isn't helpful because they aren't important in absolute terms.

The rate doesn't matter so much in this instance, because most resources would still be spend on vaccinated people. Much like the fact that when I eventually catch COVID the odds are really good that I'm going to get it off someone who is vaccinated.

If we hypothetically rounded up all the unvaxxed tomorrow most of the strain on the hospital system faces in Scotland would still be there. Vaccination campaigns can't really change that.