In my opinion, the distrust in WHO just reflects poorly on the people who are distrustful. They are so hell-bent on confirming their world view that China must be the bad guy, that they would rather believe that the WHO is corrupted than accepting the facts.
But outside of Wuhan, there is likely a number of infected persons in the population still transmitting it and waiting to resurface into more serious cases after people get back to work.
There are even multiple foreigners in China who can confirm the situation. Checkout the Youtube videos by Daniel Dumbrill in February.
Might there still be hidden carriers in the population? Absolutely. China must remain vigilant. This stuff is hard.
My wife is considering flying back to China if things get worse here in the Netherlands. I agree with her: I also think that by now China is probably safer than anywhere else in the world. Multiple provinces have downgraded their emergency level, some are even virus free. Within Wuhan, multiple temporary hospitals have closed because they are no longer needed. People are slowly getting back to work. Containment efforts are shifting from ‘preventing the virus from getting out’ to ‘prevent it from getting in from foreign countries’.
As such, we'll know when life resumes and people go back to work en masse.