Let's be honest...Joe probably didn't know how go get on the interwebz and get signed up for the vaccine. All he knew was the nice nurse came to his room as usual and gave him another shot. For something. He is probably aware enough still to know that most people don't have a nurse visit them every day to take care of all their medical needs, sponge baths, etc.
Somebody else probably has to text for him, switch his phone to camera mode, etc, etc.