I do believe the drug, just not the stats that’s coming out from China.
I think they’ve stop using the drug after failing to applied for a property rights(stealing) just days after receiving it from the Americans.
So far no antivirals have been shown to stop the virus from replicating. They are trying remdesivir (antiviral, not a vaccine) in clinical trials in US and in compassionate use, but there is not yet sufficient data to draw any conclusions. It had a little data of benefit in SARS and MERS hence the hopefulness that it will be beneficial in this novel coronavirus.