Ah, but there are exceptions, aren’t there.
https://www.cdc.gov/coronavirus/2019-ncov/travelers/proof-of-vaccination.html#noncitizen
Scroll down to see who can get in without a vax.
Guess who else gets a get-out-of-vaxx-free card...
“Persons on diplomatic or official foreign government travel”
Gee, wonder if the Harkles are vaxxed...