Only if they're allowed to be caught though. China has swept things under the rug before if it would be bad for national interests.
China is not the paragon of virtue you seem to think it is. The fact that 996 was extremely commonplace just a few years ago until workers cries out en masse is proof enough. Surely the government must've known on some level that all of its biggest companies were enforcing 996, but since it wasn't discussed widely enough, it was kept tidily under the rug since it's good for the economy. East-Asian work culture in general is toxic and China is no better than Japan or Korea.

