How do you get to that number?
As other's have pointed out this isn't the most reliable way of doing it, but it gives some indication.
1. Deaths are lagged by known cases
2. Both are skewed distributions
3. These people might have received professional care when it was available. During an outbreak, the available health care will decline.
Sure it could end up being off by a factor 10 either way, but even then it's still informative.
The infection rate is, in all likelihood, much higher than these early numbers suggest. People don’t go to the hospital for sniffles, and therefore, the bulk of infections don’t show up. Deaths almost always get counted.