The owner thinks that unvaccinated restaurant customers will give him and the vaccinated workers COVID. Can he prove this? He and those other people could have contracted COVID from VACCINATED people elsewhere. He has no idea how or where they got COVID, who transmitted it to them, or what the transmitters’ vaccination status is.
For all this virtue-whiner knows, since he got the experimental treatment and then COVID-19, he could be the one spreading it to his customers. Clearly the "vaccine" doesn't work.