Doesn’t Hawaii have the same policy? How does he travel there?
“If you are a non-U.S. citizen, non-U.S. immigrant and not fully vaccinated, you will not be allowed to enter the United States. Only limited exceptions apply to the requirement to show proof of vaccination.”
I just came back from there, and only had to prove I had it, which I did.
I doubt he'll have problems with them. They are strict, but somewhat sane.