Was that post by someone you know? Are there loads of posts like that? Just trying to get a measure on this, and understand why 'leaks' like that are not getting a mention in our media, even it they are mentioned as 'unconfirmed reports'.
The authorities must be barking mad, it's not like they can keep something like that covered up for long, even in China.
The source seems to be this Twitter account.
Uyghur activist Twitters also reporting that Han students returning from Wuhan to Xinjiang are also being detained in the concentration camps used for holding Uyghurs.
You said in your post that "they can't keep something like that covered up for long, even in China." Well, they managed to keep the detention of millions of ethnic minorities largely covered up within Mainland China, and to some extent were successful at obfuscating the situation overseas enough to create an element of doubt.
It is not unheard of for terrible things to happen in villages in China that nobody ever hears about, or at least never go beyond rumours. I've heard some pretty grim rumours about how the HIV crisis in parts of Henan province was dealt with in the early 00s. Bear in mind a lot of the time it is local officials clearing up their mess, and central government or even provincial government might not get wind of it. If that post is true, it is unlikely to be ordered by central government, but there are scenarios that I could imagine leading to it - if the village officials had done something stupid to cause the virus to spread, then they may now be taking extreme measures to hide their mistake. We shouldn't believe things posted on Twitter outright, but I don't think it is too far-fetched a situation, although I really hope it isn't true.
The big political risk here is that usually this kind of thing that needs to be covered up is restricted to a specific location and they are able to contain news coming out about it. There were some serious pension protests by PLA veterans a year or two ago, which rumour has it got quite violent and there were also roads blocked and communications blocked out of effected counties. This could still be covered up because it was limited to certain counties.
However, the fact that this has thrown the entire country into a crisis is very unusual, and makes it much harder for them to control social media posts about it. The long term political consequences could be earth shattering.