The numbers come from internacional neutral organizations that personally checked it on China (world bank, united nations, etc) so unless those organisations are china owned now, i dont think they would have any reasons to lie. Also even western journals have admited that corona deaths on china are extremelly low, i doubt the US journals that get their info straight from washington would say that china is doing miles better at the covid situation then literally everyone, unless it is such an big and unchangeable truth you literally cant hide. Also if it isnt that the real number, then what is then? Why china would not be honest about someting you literally cant hide up? If they where not succesfull on controlling the virus immediatly when it beggined, millions would be dead right now. Also everyone was able to see the massive lockdowns and the ruthless aproach of the goverment whent it comes to disease outbreaks, just some week agos an entire city with millions of people got quarentined over half a dozen cases.

This lets to the conclusion, yes, the death numbers send by the chinese goverment are real.