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Absolutely true. Although I think its possible to say they have had x10 the death rate of their Scandinavian neighbours so far.
Seems a bit early to say that no lockdown has worked well given that so many more people died. Its also too early to say that if Sweden had locked down they wouldn't have had x10 higher death rate than their neighbours.
Stonehedge-
I'm going to make a completely unscientific theory that by the end of it all (as much as there can be an 'end'), Sweden could have a comparatively similar (maybe a little higher) death rate to their Scandinavian neighbours, but a much less impacted economy and generally better mental health state.
I think the people reporting it as already having 'worked' are likely the people who disagree with lockdown and are looking for evidence that support this. Different people also have different definitions of success in those terms, some seem to think that protecting the economy at all costs was paramount, saving lives was just a bonus.
tb
At the moment Sweden has statistically done worse than it's neighbours, but that's potentially like reporting a half-time score as the final score. As @jv said, they might sail through winter with ease whilst other countries that implemented lockdown suffer. It'll probably be a couple of years before we can accurately assess which strategies worked better than others.