Smiley90...I would argue you are confusing “good vaccine” with what Covid-0 Policy considers a “good vaccine”.
I’d also dispute China is an immunologically naive population...my first bout of covid came out of a trip to china in late 2019/early 2020...given how transmissible it is, and how open China was for most of 2020-2021, it would be hard to believe it hasn’t circulated, no?