Earlier quoted context omitted.
Spot on. Medical facilities are not up to support in times of widespread epidemics. Which means most people would not get any treatment and you should expect mortality rate to increase over time as it becomes more widespread.
You can see this in provincial level mortality rates: at low infection concentrations, it's a more deadly than flu but nothing insane. But once resources are swamped (e.g. in Hubei), the mortality jumps an order of magnitude.
Hubei’s mortality rate for literally everything at the moment would expected to be higher than anywhere else given how stretched their resources are.