In the Starting Line-Up
The study you posted is from October 2020.so the press release you cite is from July 2020. The Peer Reviewed study I linked is from April 2021. IOW the press release has been superseded by a Peer Reviewed Study.
Also, it's hot garbage.
He writes: "The physical properties of medical and non-medical facemasks suggest that facemasks are ineffective to block viral particles due to their difference in scales , , ." None of the cites he provided support this. There is ample evidence that viral particles are blocked by masks, especially medical grade ones, and even more so the N95's. Also, "due to difference in scales" is unsubstantiated to the point of being meaningless.
Further, he writes: "In normal conditions at the sea level, air contains 20.93% O2 and 0.03% CO2, providing partial pressures of 100 mmHg and 40 mmHg for these gases in the arterial blood, respectively. These gas concentrations significantly altered when breathing occurs through facemask." There is no citation for this proposition because it's totally made up.