China is authoritarian without civil liberties. They could force all of the 80+ to vaccinate just as they force people to stay inside their apartments for months.
There are three reasons they probably don't do this:
1) Their vaccines don't provide high enough protection to prevent overwhelming the healthcare system.
2) They have fostered mRNA conspiracy theories and pushing an mRNA vaccine would be a huge embarrassment to the communist party.
3) Beating the US by a wide margin on Covid deaths is a point of pride.
There are three reasons they probably don't do this:
1) Their vaccines don't provide high enough protection to prevent overwhelming the healthcare system.
2) They have fostered mRNA conspiracy theories and pushing an mRNA vaccine would be a huge embarrassment to the communist party.
3) Beating the US by a wide margin on Covid deaths is a point of pride.