Diamond Princess has a raw IFR of 1.8%. The studies you were likely referring to were all done in March when the total number of fatalities was 7. That number is now 13.
Anyone who claimed to know what the fatality rate was back then is full of it. Even in places that had gotten the spread of the virus under control, there were still significant numbers of unresolved cases. And it will likely be another year or two before we have a good idea what IFR is, as COVID has demonstrated differing levels of severity in different populations, and adequate health care capacity has show to have a large impact, which large portions of the world do not have access to.
Anyone who claimed to know what the fatality rate was back then is full of it. Even in places that had gotten the spread of the virus under control, there were still significant numbers of unresolved cases. And it will likely be another year or two before we have a good idea what IFR is, as COVID has demonstrated differing levels of severity in different populations, and adequate health care capacity has show to have a large impact, which large portions of the world do not have access to.