So what? USA has more empty homes per capita (17 million for 330 million citizens, vs. 60 million in China for over 1.3 billion). If you compare it by density it looks even worse for the USA.
In any case, it's not really a useful, or meaningful metric anyway.
https://www.abc.net.au/news/2021-09-21/china-property-bust-e...
https://data.census.gov/cedsci/table?t=Vacancy&d=ACS%201-Yea...