At the end of the day, whatever China did or didn't do wrt raising the alarm sooner, it was down to every other country to respond effectively to the novel airborne virus... Or not.
We didn't have to suffer as badly as we did. Still are suffering. We could have taken similar infection control measures as did Singapore, Australia, New Zealand, Hong Kong, Taiwan, Japan, South Korea, Vietnam, and actually yes China too. Saving lives, health - and economy.
The whole world could and should have temporarily closed borders except to genuinely essential travel (with real quarantine where needed). Had that happened, there would never have been a pandemic.
We can't control what China did or didn't say. But we could choose how to respond once the threat was known. Temporary pandemic travel restrictions - with cases already here tracked and isolated, and Bob's your uncle. No pandemic.
All we can do is (hopefully) learn the lesson for the next would be pandemic (perhaps that one will be stopped in its tracks).
(Btw the Wuhan Institute of Virology bat coronavirus lab research was/is internationally funded).