It would need testing to show they don't have a prevalence of "mild" cases. Not to mention we should have numbers on how often they wear masks. Last I saw, it was not everyone that did that.
People don't wear N95 masks here, they wear cheap masks you can pick up in any drug store for just a few coins.
How would an entire country obtain N95 masks and training and proper fitting (it's done by trained fitters) and dispose of them properly, and do that daily? (if not more often)
Every time I go out I see the cheapo ones left in the street because there's a vague notion they should be disposed of "properly" so I don't see this idea working at all.
Public mask wearing prevents the wearer from emitting droplets. You don't need n95 for that. Also please read the article in discussion, this virus is not that easy to transmit, even for hospital workers.