The author may have a point but his numeric example is also comparing apples and oranges:
> If we compare, for instance, the number of people who died in the United States from COVID-19 in the second full week of April to the number of people who died from influenza during the worst week of the past seven flu seasons (as reported to the CDC), we find that the novel coronavirus killed between 9.5 and 44 times more people than seasonal flu
He is comparing the number of deaths from a disease to which we are largely immune (the flu, through flu shot or previous strains) to a new disease to which we have no immunity. Of course the number of cases will widely differ. But I think most of the educated people who compare covid 19 to the flu mean in term of IFR, i.e. the ratio of death to the number of people infected. Of course if that ratio is applied to a much greater number of infections you will get more absolute deaths.
Also is the way we account for deaths between flu and covid that different? I understand people accounted as covid death don't really die from the virus but from the effects of the virus (pneumonia, heart attack, etc). Isn't the flu killing the same way, and do we do flu tests for each death from pneumonia (or whatever the flu ends up inducing)?