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.
Also, you clearly don’t understand what the WHO does and how critical it has been in the reduction and even eradication of disease spread across the world over decades.
Further, the WHO, much like most multilateral organizations is dependent on its member states for strength. When the most powerful member state voluntarily and unilaterally chose to disengage over the past half decade, it shouldn’t be surprised that the 2nd most powerful member state is calling the shots.