By your logic, the guidance does not specify how to report symptomatic cases either. What does that mean to you then?The newest guideline didn't specify reporting standards of asymptomatic cases. Shanghai is currently reporting both symptomatic and asymptomatic cases. I like many others found the ratio of asy/sy strange and different from other provinces. I have already explained what might have caused it. That's it.
Anyway, however the guidance specifies the rules on reporting, or even not, it does not support your claim that Shanghai is not truthful with their numbers.