The US should use its own primary sources in future to evaluate disease spread. China will lie to the WHO and the WHO will protect it.
But to know the truth, we should use our modern equivalents of Key Hole. There is no truth but that which you have examined yourself.
The WHO is a forum to coordinate strategy and exchange information. Obviously, this requires a minimum of good faith, which seems to be difficult for some countries (yes, particularly dictatorships). But even then, it is better to have them within, collaborating on their terms, than to leave them outside, in which case it would be even harder to get any information out of them.
So yes, China will lie, which will make life worse for epidemiologists and governments across the globe, but not as worse as it could be with China being entirely uncooperative.
It is not the world police, and it won’t come anywhere and do anything against the local government’s wishes. Otherwise the screams world be even louder, and justifiably so.
They are working with what they have, which comes from governments and governmental health agencies. If they don’t have information, they say ‘we don’t know’, even though everyone knows that the most likely scenario involves emergence in China.
If one wants them to be able to coerce information out of China, then by definition it would need to be more powerful.
Government is just people trying to do triage, discern signal from noise, coordination, move the ball forward... with a bunch of other people.
People expect too much. It's amazing anything works at all. We should all marvel at the progress we've somehow achieved thus far.
While striving too do better, of course.