How were they verifying your vaccination status previously for hepatitis B, diptheria, tetanus, whooping cough, flu, polio, rotavirus, pneumococcal, Hib, chickenpox, measles, mumps, rubella, hepatitis a, hpv, meningococcal, etc.?
With the exception of the flu, there have been very little spreading of these diseases in Apple stores and they aren't a problem in the US compared to Covid-19 for the last year.
I wouldn't be surprised that more business will implement changes to reduce the spread of the flu in the future.