" In all cases, leakage around the edges of the mask was eliminated by the tight fit of the volunteer’s face against the high-density foam rubber surrounding the opening in the front panel used for breathing (Fig. S1)."
because that's exactly what happens in reality -- not. And of course, it's only interested in the spread of Covid. Nothing else is considered of interest. Whether people feel dizzy or faint from lack of fresh air is irrelevant.
Next, let's ban cycling to reduce those hundreds of deaths and thousands of serious injuries. Scientific studies show how deaths will be reduced to zero.