you are absolutely correct. The data we have is the data we have. you just have to understand the limitations of the data you’re working with.Regarding the 3.4% mortality rate, the WHO explicitly says that is the rate for reported cases. So it’s for cases that have been verified by testing. Realistically, what else could they report? They can’t just make a guess about the number of unreported or untested cases and report the “real” rate based on a guess.
Most likely there are a large number of unreported cases, and if you included those, the mortality rate would be lower, but the fact we don’t really know how widespread the infections are says a lot more about the shortcomings of the testing than anything else. I’m looking forward to more widespread testing so we can get better information.