Um, you should probably look at what actually happened.
Was there a reason you made this post?
The hash rate did drop ...
2021-05-13 08:55:45.132+00 25046487590083.3 = 25T
2021-07-17 23:32:17.142+00 13672594272814.1 = 13.7T
So a total 45.4% drop over ~2 months
So how can you say they were preventing a hash rate drop ... by causing a hash rate drop?
I understand what you are saying, and I get that it's not really logical, but what effect would it have if it was directly caused by an energy shortage (where the plug could've been pulled immediately) instead of the ban declining the hash-rate in 2 months where miners had the possibility to relocate themselves?
I'm not saying this is the case, but I was just wondering if there was a relation between the BTC Mining costs in electricity and the power crisis in China. Hence why I posted this thread.