Yeah, that was obvious from the data. (Post #551, 3/15/2020). So the news isn’t that it was grossly understated. The news is that they have, for some reason, admitted to having more deaths.
My guess is, it’s still understated. Likely they are bringing the rate up in stages, so as not to freak people out.
Here’s the data that say the death rate was 4%. This is from the WHO report on China. These are the data the used to claim a 4% death rate. Not even remotely credible. Read my prior post if you want to know more.