Why should I take the denials of a pseudnonymous online account without evidence?
I'm guessing the next part of your conspiracy theory is that the conspiracy group is so powerful that everyone is scared to come forward. But if they are that powerful, why construct such an ineffective anti-china story? Surely such a powerful group could construct something more damaging.
Likewise, I don't believe anyone is coercing you to push these ideas online. I believe I could drill down on every single source and claim, and your fundamental beliefs about this question would remain the same.
Proximity to and dependence upon established institutions exerts an inexorable gravity on worldview. It determines one's social circle and path to advancement in every area of life. Those inside the bubble feel themselves to be 'free thinkers', but one who strays outside the acceptable range of beliefs and ideas will immediately experience a sharp discontinuity in this 'freedom'.