Nobody, not even our most senior epidemiologist Dr Fauci, thinks this is close to 0.1%. The lowest recorded in any country is South Korea at 0.7%, and they do SUPER widespread testing and likely have the best sample. However - this is a very rough case fatality rate done by dividing the total number of deaths by the total number of cases.
This is not the best way to do it, because it takes about 3 weeks from infection to die from this thing. The right way is to divide the total number of deaths by the total number of cases 3 weeks ago.
But even then it's not so simple. How many factors are bringing it down (undiagnosed asymptomatic), how many are bringing it up (over capacity health care system, which increases fatalities dramatically, hence "flatten the curve"). PhDs will be earned determining the case fatality ratio on this. Estimates seem to range from 0.7% (asymptomatic carriers, elderly die first, fatality rate drops) at the absolute lowest to 5.6% at the absolute highest (over capacity health care system, 3 week lag time in deaths).
No matter what, it's not going to be "just the flu".
Do your part and help flatten the curve so that we trend as close to that 0.7% as possible.