Well naturally I can't buy into things such as these ideas without proper evidence, however I will say that because of their habit of absolute denial and supreme control over information, it lends itself perfectly to such ideas gaining ground because, unfortunately, nothing is too extreme to be implausible when it comes to the CCP.
I don't buy that this was manmade at all, but if I was proven wrong one day, I wouldn't be 100% shocked. We know they are doing Mengele-esque experimental operations and medical tests and beyond. We don't know to what extent they area happening, however. It's a very dark country indeed