That's just the official bullshit, brought to you by people who a short time before were saying masks were worthless. Really masks work both ways: they filter incoming air as well as outgoing air.
It's hard to tell, though, whether one really has a good mask or whether it's a scam. Nothing wrong with the KN95 standard, but there are a lot of scammers in the world, and a lot of factories that have suddenly entered the business.
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Of course nothing will replace proper testing. A simple test I conduct at home, though, is to spray them with deodorant in sunlight. Does it allow the aerosolised droplets through? You've been duped, open a dispute. Be sure to order on a site where you can open a dispute.
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