I think the bigger issue is finding the places where strict mask use has reduced COVID. You seem to think there is a lesson to be learned however I'm unable to find any data that support that lesson. Yet, you assert it like it's truth, as if you know the truth and can back it up somehow, but you don't.
The person you are replying to isn't asserting that masks definitely work. He's asserting that stating "you don't need to wear masks" is not the same as saying "masks don't work".