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I always love when someone posts like one single "study" that almost always doesn't even qualify as amateur hour (eg data mining) and thinks it's some sort of mic drop, as if there aren't 25 disconfirming studies or data points for every one thing saying masks have even a faint amount of efficacy.
I'm not totally sure about 3, my guess is that we have collected far more useful intelligence that our agencies have released, but nothing sufficient to make a geopolitical claim about China, and the cost of being wrong with such an accusation is huge.