[FrojoS]

Your CFR is with respect to diagnosed cases. Many cases are mild and have no symptoms. The real CFR is likely an order of magnitude lower.

[alexandercrohde]

That's one theory, but the evidence is mixed. For example, I believe in cruise ships, where everybody was tested the CFR was ~ 3%. However maybe the age distribution was older.

There are a lot of factors, some cause underestimating of cfr (he died of pneumonia, didn't have a test to spare, cause of death pneumonia).