At this point new cases in China are declining. They may have misstepped seriously at first but their heavy handed response seems to be working out now.
Same with Singapore, due to the close family and business connections to China, there was a flurry of early cases but rapid contact tracing and quarantine has slowed the spread.
It came at significant economic cost, but China's quarantine worked, and the processes established will likely continue to help protect China from another outbreak from re-importation.
If not, it's just hard to believe.