My mistake, the link in the article you first posted still shows it as a working paper and I couldn't find it with the original title when searching.

Interestingly the DOI does not show up

https://dx.doi.org/

Here's some further criticisms:

https://www.researchsquare.com/article/rs-1073440/latest.pdf

https://arxiv.org/abs/2112.01296

https://bmcpublichealth.biomedcentral.com/articles/10.1186/s...