This is an incorrect calculation. One should not look at the total number of cases, but only at the cases which already had an outcome. You should only look at the people who recovered, versus the people who did not recover and died. We don't know yet the fate of the patients who still suffer from the disease.
I'm looking now, at the moment of writing this, at Germany's statistics at
https://www.worldometers.info/coronavirus/country/germany/ and see that of the almost 25 k cases 360 had an outcome. 266 recovered while 94 died. Those numbers put the death rate in a