The idea that they were "pardoned" for anything is ludicrous. To be pardoned, you have to have committed a crime. Pardons have been granted (in a few very rare cases) before someone was convicted of committing a crime, but they usually don't come into the picture until after conviction.
Unless someone here knows something I don't (which is entirely possible), Pfizer and Moderna haven't haven't been accused or even suspected of any crimes in connection with the Covid vaccines by anyone except rabid antivaxxers and deluded, horse paste guzzling, MAGA cultists who have no actual evidence to back up their suspicions, so there would have been nothing for Joe to pardon them for.
I could see people who are sufficiently befuddled to insist that vaccines don't save lives confusing the temporary protection with a pardon, but it's clearly something entirely different. Among other things, a pardon is forever, not "until 2029" or some other future date! 
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