When H1N1 was last an issue in 2009, the reported case fatality rate was 2 - 2.9% (search the news stories of the day, or academic papers), it was only after they did the antibody tests was it revised to .02%.
Apply that to today, the 4% rate is a case fatality rate, in the aftermath when they do the antibody tests that will fall drastically. I am not saying it will be the exact same ratio and covid will go to .04%, I am just saying case fatality rate can be very misleading. Just look around the globe and current reported case fatality rates range from .15 to 20%, that is not what I would call a focused range, seems about as accurate as Mitch Trubisky trying to hit a running back in the flat.....