Sounds to me like China is trying to solve both of those problems by lowering property scarcity - if this stays controlled it will make properties cheaper so people don’t need to acquire as much debt and it will shrink the real estate sector. Since this housing is built through centralized control and not a market, it should be totally under control.
Obviously something unexpected could happen that blindsides the Party, but it looks like politics is in command and everything is proceeding as expected.