I don’t think that is actually what the 2% means. According to the CDCs report on information from the Chinese government:
That is only 2% if you assume that all the people currently sick will get better. For a new rapidly spreading infection that is more of a lower bound. Also, given that it sounds like the hospitals in Wuhan are pretty overloaded, the outcomes there will probably be worse than you might expect in an area with a lower density of cases.