Apparently, most of the vaccinated people are young, and the Sinovac is probably worse than Pfizer or Moderna. Plus, there is no group of people who are naturally immune because they have gone nuts trying to get to zero covid.
There's a chart with the death rate in the attached article.
Link: https://www.theguardian.com/world/2022/mar/18/hong-kong-covid-crisis-why-is-the-death-rate-so-high