Would you risk illegal, easy-to-detect, energy-guzzling and noisy activity for the potential profits? If you do, many people will not risk it, so since mining was banned in China, miners have moved to other countries. There may be a percentage of mining in China, but the main mining basins, which control a good percentage of hashrate, are outside China.
See the percentages here https://mempool.space/graphs/mining/pools and search for pools locations.