China announced new changes to the case definition. Clinically-diagnosed cases will no longer be considered confirmed in Hubei; diagnostic testing will needed for confirmation. 
Also, the discharge criteria remain at 3 days afebrile, improvement in symptoms and imaging, and two negative PCR tests at least 1 day apart. Quite strict, which accounts for the low discharge numbers. nhc.gov.cn/yzygj/s7652m/2…
The new case definition is more in line with traditional categories. Alternately, sometimes suspected, probable and confirmed are used. It's also normal to stop testing at some point when case volume is high. which I think motivated the previous version allowing clinical conf.
and for all the tweets I get asking about data quality, changes to the case definition are not unexpected with a new disease. as we learn more and as our surveillance needs change, sometimes the case definition needs to change too.
