As this article says:
The giant data set was never made available for inspection by other scientists, which would be critical for demonstrating that results are reproducible. More astounding, the private and secretive company that owned the data, called Surgisphere, denied full access to the papers’ authors too. That’s bad faith, and it violates best practices for respectable science.
The ability of scientists to check and interrogate data is fundamental to science. Science based on inaccessible data should not be used as the basis for policy (as WHO did with the article being discussed in this article.