How, if all data from Wuhan is off limits?
My complaint is that this letter should be addressed to Mr. Xi. But instead they make it sound like this is a global issue.
It is only China that is blocking all research into the origin. No other country has placed any blocks or limits on the research.
Furthermore, your focus on China is revealing. Other nations botched their response to COVID-19 and that is their responsibility. There is no good reason for COVID-19 to have become so deadly. The blame for the impact of COVID-19 belongs with all the developed nations that had every reason to know there would be more coronavirus outbreaks after SARS and MERS and decided instead to focus on politics or on ineffective strategies such as hosing down streets with bleach instead of responding coherently to the pandemic.
Like most science all of the statements here can be verified with respect to the sources cited. Saying that the origins of SARS-CoV2 have not been conclusively established but are of great interest is not controversial.
If there is any lack of credibility here it is with lab leak hypothesis enthusiasts failing to supply solid evidence and then claiming that criticism amounts to both censorship and a kind of indirect proof of their assertions.