How does that refute the fact that the Mayo Clinic says that wearing a mask won't give you hypoxia? Also, what's the date on that article? Because it looks lik

How does that refute the fact that the Mayo Clinic says that wearing a mask won't give you hypoxia? Also, what's the date on that article? Because it looks like April 2020. There's been several studies since then, along with just the raw statistical data, that shows masks do help. https://www.npr.org/sections/back-to-school-live-updates/2021/09/10/1035954587/yes-gov-desantis-studies-do-show-masks-curb-covid-19-in-schools https://www.npr.org/sections/back-to-school-live-updates/202...