This is a lie. China now has another outbreak, and several country's intelligence agencies have suggested that their original numbers were completely made up.
Proof:
1. China's numbers simply do not match models that take all their measures into account.
2. China only tested syptomatic people, and did not classify pneumonia sufferers as COVID: https://www.reuters.com/article/us-health-coronavirus-china-...
3. Wuhan crematoriums are seeing way more deaths than reported: https://www.vice.com/en_us/article/88435z/wuhans-crematorium... http://www.asianews.it/news-en/Wuhan,-endless-queues-for-ash...
China's new outbreak: https://www.aljazeera.com/news/2020/04/china-fears-wave-covi...