@jesse_b No, the percentage of deaths is a pretty strong number. A death person is someone that died, there is no much hiding that could be done in that number. And "confirmed cases" result from lab tests, Labs could also independently report the number of tests that were positive.
If what you mean is that a person could get infected and, after not being detected, would **not** die, then yes, that number could be lower, even much lower.
But that is **very** different measurement and indicator.