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The problem with using that kind of data is that while the Diamond Princess was a perfect laboratory the time of observation is not sufficient. I provide a further breakdown showing that the disease was in it's early stages and additional deaths are likely to have occurred in the weeks that followed changing the estimated fatality rate.

As of March 15 in 2020, the total number of confirmed cases with coronavirus disease (COVID-19) on the cruise ship Diamond Princess reached 712 patients, including 567 passengers and 145 crews.

As of February 20, tests of most of the 3,711 people aboard the Diamond Princess confirmed that 634, or 17 percent, had the virus; 328 of them did not have symptoms at the time of diagnosis. Of those with symptoms, the fatality ratio was 1.9 percent, Russell and colleagues calculate. Of all infected, that ratio was 0.91 percent. Those 70 and older were most vulnerable, with an overall fatality ratio of about 7.3 percent.

Mortality numbers lag behind infection numbers simply because it takes days to weeks for severely ill people to die of COVID-19. Thus, current death rates should properly be divided by the number of known infections from the previous week or two, researchers wrote in February in Swiss Medical Weekly.