The claim in post #3 is the link. It calls something a bad idea without knowing what the Chinese already know: its biology in the natural reservoir.
That is the problem, that no one knows what is in the natural reserve.
People mistakenly think we understand DNA because we can do a gene sequence.
But all that means is we can determine what all the part ARE, NOT what they DO.
We likely will NEVER understand what DNA or RNA sequences do because they do so many different things, depending on other factors, such as age. Think about something like puberty that happens over ten years delayed?
It still comes from your DNA, but you could not be able to tell what DNA does it without a 15 year long experiment.
And clearly the dangers from covid-19 that are killing so many people, do not come from covid-19 at all, but instead are from our own immune system.
We do not know why our own immune system is freaking out and killing so many people.
And since it is not the covid-19 but our own immune system that is the danger, is it incredibly risky to fool around with the immune system by simulating covid-19. The risk of triggering a response we do not understand, is huge.