ICYMI lots of issues with that study, https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa155... https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa156...
[1] https://academic.oup.com/aje/article/doi/10.1093/aje/kwaa093...
[2] https://www.newsweek.com/key-defeating-covid-19-already-exis...