Obviously an n of 1 proves nothing, but like all singular and extreme cases it can often be a fruitful source of inquiry. A lot of progress in science has been achieved by understanding the exceptions. So I’m glad his case was written up, maybe some science can come of it.
My unscientific musings in this case were that it’s notable that he’s just a random guy. It’s not the case that an individual was selected, or selected himself that is exceptional in respect to vaccine reaction. He’s a random guy. If he were a one in a million vaccine tolerant freak, then you could say, “217 shots, yeah, one in a million physiology”, and ignore his case, but no, he was a random guy, since what are the odds that the 217 shots fell on just the “one in a million” guy (actually, odds are one in a million, by definition, heh).
So, you pull a random guy out of a crowd, and you shoot him 217 times with covid vacc and zero negative effect. That tells me that a random person - perhaps you or me - can potentially take at least 217 covid shots and be none the worse for the wear. I find that thought encouraging as I contemplate the possible risks of taking the covid vaccine a couple of times a year. Not some profound proof of anything, but a cheerful tidbit as I’m about to roll up my sleeve later today. YMMV.