I can find you 300 articles each quoting Sichuan with anything from 10% to 107%.
Here is 54%:
https://thenextweb.com/hardfork/2019/12/11/bitcoin-cryptocurrency-mining-hash-rate-china-renewable-energy-blockchain/Here is 70%:
https://news.bitcoin.com/chinese-miners-flock-to-sichuan-for-cheap-electricity-during-the-wet-season/Everybody is just throwing figures around with no real basis.
What's the correlation between mining hash rate and Bitcoin price?
Price dictates hashrate, simple as that.
First of all, the hashrate has never been higher. The recent drop due to the halving plus the events you have described have only taken us back to the same levels we were at at the end of last year, and remains higher than everything from September last year back to the genesis block. When we were pushing $14k back in June, the hashrate was only around 63% of what it is now. When we peaked at $20k in 2017, the hashrate was approximately 15% of what it is now. There is no real correlation between hashrate and price.
Unfortunately, you're missing something, just as the world was missing something, ... mining gear
An s9 went for 3000$ (twice more than at launch!!! and we were already 2 years later and we're talking about used gear)
Simply there was no way for the hash rate to grow, there were no machines left, there was nobody capable of producing them, nobody could produce 20 times more miners that had been produced in history in a matter of less than a year. That's why the hash rate couldn't keep up.