The researchers did a bunch of tests and determined that he never had COVID, though they cannot attribute that to 217 boosters specifically. They noted that it could’ve been isolation, hand washing, etc.
Better to quote directly from the article:
Last, multiple types of testing indicated that the man has never been infected with SARS-CoV-2. But the researchers were cautious to note that this may be due to other precautions the man took beyond getting 217 vaccines.
Oh sorry, I thought by protection you meant masks and social distancing. It’s been a long week! Yes we’re all vaccinated. I’m immunosuppressed so they weren’t sure if my body would respond but apparently so!
I am unsure if I ever got the virus. Every single time I thought I had it my test came back negative, but my wife and kids got it twice. So it just doesn't seem likely that I never did.