What do you mean? The immunity doesn't kick in the second the vaccine is injected into your arm. How else should they count vaccinated vs unvaccinated? (Also note that there is a category of partially vaccinated in the stats that is people who have only received the first dose of a two-dose vaccine).

These stats do not show the difference between taking a shot but still being infected within two weeks after it, and not taking any shots at all and being infected. If you're going to blame the second group for filling up ICUs, you cannot lump them together.

It means the stats aren't as useful.