However, it may be localized in a sense that it seems only Han Chinese are susceptible to it. 99% of the deaths have been Han Chinese, which implies a level of immunity for everybody else.
The outbreaks in Iran and India and Italy debunk the claim this only affects Asians.
Asians just happen to live near Wuhan.
Do you have a source for your 99% stat? I have not seen any victim racial data published.
While it is certain that more Chinese have died from this than any other ethnicity, that might just be because this thing is going on in a place mostly populated by Chinese...
It seems to have a healthy appetite for Koreans, Japanese, Iranians and Italians.
It may have a lot more to do with sanitation practices than anything else in it’s spreading and mortality rate.
Keep in mind that the sanitation practices in Asian countries is still pretty primitive and that is a big factor. I.e. they don’t have western toilet methods.