I’ll say it yet again though I know that you will misrepresent it:
1) Homemade masks are placebo. They are a joke.
2) The general public does not use masks properly (most non surgical trained doctors don’t even follow the rules properly). The studies used to justify this policy assumed proper usage that is not really even possible in the general population.
Also, the best masks filter particles down to a level of about 300um while the virus is much, much, much smaller.
The “blocks big water droplet” rationalization is a completely arbitrary, nonquantified, and non scientific argument that would have to depend on the infectivity of the viral strain itself as to how little innoculum is needed to pass the infection. These factors were not evaluated when the recommendations were made. Thus, while I will withhold criticism on using actual medical masks which at least have an potential CHANCE to help once in a while, I must point out the outright stupidity of homemade masks which provide no real chance at all and when better alternatives exist.
3) The CDC itself backtracked part way on homemade masks (and I believe didn’t abandon them completely all at once for the sake of avoiding more embarrassment. They now say they are “less effective”. Do you know what else is “less effective”? Placebos.
Your best hope here is to find retrospectively that the masks helped, but even then the minimal benefit would be vastly outweighed by the downside of the mask policy.