Unless you're homeless with no relatives (which is very rare in china), your family would be bound to at least ask how are you doing in the hospital, if you're deceased the government would release the names (data, initials, etc). I don't think it's possible for China to detain the names, if they erase it out of thin air people would start questioning what happens with their loved ones.
Say you're my uncle, you're hospitalized, I sure as hell would check up on you. If you die and the government decides you're one of the names they won't divulge then you can be sure I will raise the issue.
China isn't north korea, there are reporters there from all over the world. There are expats, there are other nation's ambassadors, tourist, attache, etc. If there are foul play we'd be hearing more concrete accusations from many other nations.
Wuhan has like 10-12M? people? If the number is much higher say 2x or 3x the official reports, there's no way that city would hold, the contagion spreadings would be 3x-4x. China released 100k positives, if you suspect there will be more people sick than hospitals, chaos would ensue, long ques outside hospital, people dying etc. And so far that hasn't happened or we would have known.