So you're saying the mortality rate for someone getting COVID today vs 2 months ago is the same?!?This study is way more useful than the garbage study arguing a stupid point from hindsight. It demonstrates that wearing a mask reduces the R0 of of the virus spread.
Back to that stupid study, we've been droning on for pages now that containing the virus was no longer an option the moment confining it to China failed. Locking things down sooner would have merely pushed back the date when more people get infected. Who really cares if we get infected today, or 2 months from today? We would have saved zero more people by locking down sooner, we'd simply have pushed back their deaths by a couple months.