This passing statement is rather telling:
"Indeed, recent work by Liu et al. demonstrated that some of the highest counts of airborne SARS-CoV-2 (the virus responsible for COVID-19) occurred in hospital rooms where health care workers doffed their PPE, suggesting that virus was potentially being aerosolized from virus-contaminated clothing or PPE, or resuspended from virus-contaminated dust on the floor47. It remains unknown what role aerosolized fomites play in transmission of infectious respiratory disease between humans, and it is unclear whether certain types of masks are simultaneously effective at blocking emission of respiratory particles while minimizing emission of non-expiratory (cellulosic) particles."
The best evidence of it being a sham study is this passage:
"Here, we measured outward emissions of micron-scale aerosol particles by healthy humans performing various expiratory activities while wearing different types of medical-grade or homemade masks."
Cited references for "particles" in the "micron range" all refer to particles in the >2 micron range except one.
In consideration that SARS-CoV-2 is approximately Images below for reference to all:
N95 Outer Layer
N95 Fine layer
Disposable surgical mask (medical grade):
T-shirt
Note: The small dot to the immediate right of all 4 of the Coronavirus graphical representations us the virus to the SAME SCALE (you may need to zoom in; the enlarged representation is provided for visual effect to locate the properly-scaled virus, which is smaller than a decimal point at that scale).