We can take the official Chinese figures at face value or not. The Chinese government is stating that the total number of confirmed cases is just under 90,000, some sources in China reckon that number should be 640,000.
We have no way of knowing which is more accurate.
We know some countries are definitely under reporting, several in central and south America for example. Russian figures look a bit dubious too, but again, dubious and provably false are not the same thing.
In the UK every death which has Covid-19 mentioned on either portion of the death certificate is recorded as a coronavirus death, wherever it occurs. My wife recently held a service for someone who died at home, having been sent home from palliative care in a hospice to do just that. The death certificate mentioned Covid-19, but her family, rightly in my opinion, do not believe this was the cause of death. She was NOT tested. The lady died primarily from a lung cancer for which she had been treated for the last 18 months and from which she was terminally ill.