Earlier quoted context omitted.
>The general issue with this measure of mortality (dead/infected) is that you're assuming that the infected won't die. On the other hand, there are also a lot of infected who only have a mild version and are never checked and recorded, which swings it in the other direction. Edit: Seems like the parent post later edited their post to mention the above.
In the hardest hit areas like Wuhan, almost everyone has been tested.
Very doubtful. This is a city of 11 million people. I doubt they would have the kits or lab capacity to test even 1% of the population so far.