China's initial dismissal and coverup of the spread of the virus, and their subsequent misinformation and lack of transparency, and finally, their attempts to stop an investigation into COVID origins are really seriously bad things.
To boot - they've made a political appointment to the head of the WHO and have been trying to obtain leverage within that organization of years.
It's actually reasonable that the US demands expulsion of China from the WHO on those grounds, until China plays be the rules. They can't claim 'it's an internal problem' as they always do here. Much like with currency and other things, if they want to be a part of these organizations they have to follow the rules.
I think “The COVID-19 pandemic was avoidable. Any responsible country would have invited world health investigators to Wuhan within days of an outbreak.” is counterfactual by definition.