Until we have better data I think that it is entirely appropriate to treat all current data from KZ government as intentionally falsified and either apply a reasonable multiplier (historically from other similar cases, a 10x multiplier seems appropriate; certainly that would be a better estimate than accepting their reports at face value, in similar earlier situations the reports always have been intentionally adjusted) or treat the local estimates as the best estimates currently available.
Read the article, it's in there.
The whole point of HN is to comment on the article. BBC is obviously UK government propaganda, so the fact their headline is clickbait and the little data they do include doesn't support it is relevant.
Russia seems to be pretty run-down lately in the east. Especially with Chinese investments basically buying out the usual province robber barons and slowly replacing the owner-caste.