>The new Soviet Census (1939) showed a population figure of 170.6 million people, manipulated so as to match exactly the numbers stated by Stalin in his report to the 18th Congress of the All-Union Communist Party.
https://www.reuters.com/world/china/researcher-questions-chi...
Lots of sources question population data as well as all other officials statistics. Nobody care. It is not just numbers, it is political statements.