That source is awful, just an opinion piece, largely. "Wearing facemasks has been demonstrated to have substantial adverse physiological and psychological effects. " It's literally the opposite. Pure garbage, that link.

Here's some quality sources:

https://www.pnas.org/content/118/4/e2014564118?fbclid=IwAR0j...

https://www.sciencedirect.com/science/article/pii/S2666142X2...

https://www.medrxiv.org/content/10.1101/2020.08.12.20173047v...