Their vaccines (both Sinnophram and that other company) had, at best 50% effectiveness against the original strain of of COVID but not against the newer variants. But yes, they had a series of scandals of fake vaccines being given out in China and aboard because they were scammers. Yes, China had, in the past, major vaccines scandals that ended children up in hospital. Yes China and their legions of Wumaos (internet trolls. Some paid some were just hyper nationalists) went online with VPNs (which is illegal for the average person in China to have/use) spreading disinformation on Western vaccines, along with the Russian trolls (one of the biggest lies being, "Western vaccines won't work for Asian people" etc...) But the Chinese government had mandatory vaccinations, but with the weaker Chinese vaccines. Now that they just drop all Zero COVID policy it is spreading but it's not wrong for Western countries be cautious about this situation.