It’s a positive-sounding report but appropriately qualified with caveats that another ~2 weeks are needed to clarify whether the appearance of milder disease persists, or reflects a difference in how the disease progresses.
Most places have let restrictions ebb and flow accordingly.
While in my other reply I express my doubt at "change in behavior" being the driver of any sort of economic impact similarities, say it was. In that case, what it would show is that overbearing government removals of freedoms to the extent that you can't even go out in public are not even needed to have that effect in behavior.
But that being said I'm not sure we fully understand why the virus didn't hit Japan as hard. The country does have a stronger mask wearing culture (where people actually fully cover their faces) and a homogenous genetic makeup.