Well, the link says 39-56 M illnesses, which means symptomatic infections (although some of them may be not diagnosed by doctor), while the 0.37% for covid-19 i

Well, the link says 39-56 M illnesses, which means symptomatic infections (although some of them may be not diagnosed by doctor), while the 0.37% for covid-19 is just number of seroconversions (including asymptomatic infections, which are not considered illness), so not a comparable number. With 39M-56M estimated cases, 24k-62k deaths and 330M population, you have 0.06%-0.11% fatality rate and 0.007%-0.018% mortality rate.