Did you notice that these letters are essentially critiques to the methodology of mask studies generally and Cochranes meta analysis approach, not evidence that masks work. They appear largely valid criticisms. That is the basis of good science -- peer review. But the problem is, no one has shown or pointed to a study that really shows that masks are effective is reducing respiratory virus infection rates. That was the claim that resulted in us masking up, world wide. "Proven effective." Where and by whom? "Follow the science".
What did those reactionary, "on the take" Trump voting, scientists from the UK, Canada and Australia find? 1, the mask studies weren't very good. 2, Shit in, might mean their meta analysis might result in, shit out. 3, with these limitations the meta analysis shows no clear evidence that masks, regardless of type, even when used by medical professionals, were effective. 4, Modest prophylaxis was demonstrated by hand washing (ignored universally after a few weeks).
I vote democrat, always have. I hate Trump, but bad science, is bad science. I'm not so tribal to ignore the reality that the claim of "science" was misappropriated repeatedly, an action history has show to be very dangerous, January 6th dangerous.
"Following the science" isn't a political catch phrase, it should have been done, but wasn't. Public health officials turned out to be just as bad as the anti-vaxxer crowd, following hunches while ignoring what science had to say.