This doesn't answer your question, but it's worth pointing out that what "worked" for Sweden wouldn't necessarily work or flatten the curve elsewhere.

Sweden has a healthy population, tons of spare healthcare capacity, inexpensive healthcare, a high propensity to social distance, an outdoorsy culture, low socioeconomic disparity, and very few people living in multi-generational households. The US, sadly, has none of that.

Also, Sweden did have a few restrictions in place. They shut down high schools and universities, and strongly encouraged WFH if possible. Arguably, most of red state US had even looser restrictions than that.

HN's perspective on lockdowns might be skewed by the fact that most of us here live in places that actually did have a good faith reasonable response to COVID, but it didn't really work in the absence of a coordinated nationwide response.