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.
If the Western world would have done what the WHO advised at the time, we all more or less would have a COVID stuation like the Chinese have for some time.
That said, I don’t share the optimism of the parent poster. This would be a heavy burden in terms of freedom and human rights for a result that is far from certain. There have been some resurgences, the extent of which is of course unknown because the truth would be damageable to China. And there is no knowing whether the next variant would start it all over again, in which it would be back to square one.
WHO changed its position on masks as late as June 2020. https://www.webmd.com/lung/news/20200608/who-changes-stance-...
The US government changed its stance by April: https://www.dallasnews.com/news/public-health/2020/04/08/why...
In much of the world, people who wore masks were subject to ridicule, especially on social media because of the cynical public health messaging, which seemed to be about preserving stocks of masks for healthcare workers by telling the public that “masks don’t work” (https://www.nytimes.com/2020/03/17/opinion/coronavirus-face-...).
The New York Times op-ed above, and efforts from the Czech Republic made discussing public masking more acceptable in the US, and then the rest of the world.