It looks like a real conspiracy theory, but in fact I think there is a reasonable explanation, which consists of a lot of details.
First of all, it's news number one, and of course there are a lot of opinions, assumptions, etc. now. And it's almost impossible to cope with this huge information flow, so it makes sense that the data is starting to check more tightly, because it's impossible to understand the hundreds of data that openly contradict each other.
Secondly, China has become a hotbed of the virus, and that's also a well-known fact, so I just don't see any reason why they would prevent me from finding a cure, and so on. The virus can come back to them at any time, so you have to be prepared for that. And they definitely need help from other countries.