Otoh, the epidemic in the US is likely growing exponentially, and that encourages the current CFR to underestimate the actual CFR as new cases haven't had time

Otoh, the epidemic in the US is likely growing exponentially, and that encourages the current CFR to underestimate the actual CFR as new cases haven't had time to die. In terms of estimating the IFR, it's hard; estimates are about 0.7, much higher than flu. Your link says 'mean R0 1.3: range 0.9 to 2.1'. Compared to the mean R0 of flu, this disease spreads substantially more and is more lethal, hence is a good counterpoint to the flawed argument of the post that I was replying to.