Sounds more like "you guys just happened" to be right rather than "you guys used logic and reason to arrive at the correct conclusion." Especially when he mentions heuristics at the end.
I don't think Scott is really remorseful about his foolish advocacy for vaccines.
He's implying that the anti-vaxxers just 'got lucky' and there was no systematic reason for them to oppose the vaxx.
That would be a safe bet for at least 50% of people who didn't take the vax. Being anti-authority and contrarian is a personality type (I happen to have in spades)... it doesn't mean that type reasons out and pinpoints why they do every single thing.
I haven't watched any of the Adams content related to this topic, so I have no opinions on his remorsefulness. And frankly, I don't care about anyone's remorse over the way we were treated during Covid. I shall not forget and I shall not forgive.
I just mean that his whole shtick is persuasion and psychology and probability. From that lens, it's a safe bet to believe that anyone who is right about anything just fell ass-backwards into it. It's not ALWAYS correct, but it's generally correct enough to allow you to make some moves based on the assumption.