If I guess the time, and get it right, do I know the time? No, says common sense, and nearly all theoretical and formal epistemology. If I guess that it will rain tomorrow, am I any better off? Presumably not. Yet we assess predictions almost entirely by whether they are right.
I do think Swedish predictive work was broadly accurate, compared to, for example, the models produced by Imperial College London. But more importantly, I think their stance was rational. They did what was right given the evidence. That isn’t the same as being right in the sense of landing on the truth. But there’s nothing either epistemically or morally significant about the latter. The former, however, is both. Sweden behaved more reasonably than any other country, or perhaps at least as reasonably as the most reasonable, given that there was room for reasonable disagreement.
The stance on Sweden is another version of the intellectual intolerance of the age. And it ignores the evidence. Sweden has done well: not perfectly, but no country has, that I can think of. Whether it comes out tops long-term is up in the air. But there is good reason to think it will – at least as good as the reasons to think it won’t.