The vaccine doesn’t prevent infection; it mainly prevents death. The other way to interpret this is that they do not want to be responsible for deaths, but are

The vaccine doesn’t prevent infection; it mainly prevents death. The other way to interpret this is that they do not want to be responsible for deaths, but are fine with low-risk infections. I anecdotally know people who had a booster and were still subsequently infected. Packing 200 people in a room over 100 days and these rare cases will happen.