For people quoting 3%+ death rates...that's for confirmed hospitalized cases.
It doesn't mean 3% of people with COVID19 die. There are likely thousands of people who got it who were asymptomatic or mildly symptomatic and recovered on their own. Thus, they weren't hospitalized and aren't included in the denominator of the percentage. The *true* death rate is likely much, much lower....probably much less than 1%.
For people comparing the 3% rate to the quoted 0.1% rate for influenza, the 0.1% rate for influenza is based on ALL cases, including estimated numbers of people who get it, recover, and are never hospitalized.
If you want to look at just hospitalized cases for influenza, CDC estimates there's about 500K cases of influenza that require hospitalization. Death rate is about 40K per year. That's 8%!!!!
But it doesn't mean that 8% of the people die from the flu. Once you include everyone that gets the flu (non-hospitalized), the rate goes down to 0.1%.