0.1% isn't there lower floor if they are over counting deaths from Corona. Here is an example of one such case https://www.mercurynews.com/2020/03/26/boys-death-no-longer-...
Not to mention misattributions in the other direction - e.g California's discovery of earlier cases, and subsequent backdating or earliest known case.
The attacks on counting likely/suspected cases reek of motivated reasoning
So seeing as total cases are likely underestimated and total deaths are likely overestimated, the 1% hardly seems to me to be the lower floor.
[1]https://www.bloomberg.com/news/articles/2020-04-22/almost-9-...
[2]https://www.reuters.com/article/us-health-coronavirus-ventil...