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As the number of previously undiscovered infections rise the mortality rate plummets.

As in this FR post: https://www.freerepublic.com/focus/f-bloggers/3827759/posts

I highly doubt 86% of cases are so mild they go undetected. It is very odd for any particular virus to have severe symptoms across a range of people, then have a bunch of people with... nothing. If you're taking that number from the Chinese study, well that poses a couple problems. Mostly, it's out of China, so it really can't be trusted at face value no matter what. Secondly, their study oinly states that the rapid spread was due to infected people not being confirmed to have the virus, NOT that all those people were perfectly healthy-appearing. Many of the Chinese infected in the hospitals were never officially tested, so they were never included in China's official numbers. But certainly contributed to the viral spread. Also, lots of sick people were given diagnoses of 'pneumonia' or 'respiratory issue' or something (NOT Wuhan virus), to hide the case count within China.

Also, SKorea has been pretty diligent about testing everybody even close to in contact with infected, whether there's good reason to test them or not. SKorea and Bahrain are more than double the next country's testing rate, and over 50x more then these US's. So we can easily assume that SKorea has a rather minimal number of non-confirmed cases, definitely not anywhere near 86%. Probably closer to 5-10%, if even that many. And yet, they still have a best-case CFR of ~1.35%.