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Here are a couple of excerpts from the article which might answer some of your questions:
There was another guest with Dr. Gandhi from Mayo but I did not catch his name. They are definitely theorizing that some people can have cross protection to COVID from other vaccines (like influenza & pneumonia vaccines) and also that wearing a mask (if you are exposed to COVID) lessens the viral load so you are more likely to get a mild or asymptomatic case than if you had a major COVID exposure without a mask. So wearing the mask definitely protests the wearer in addition to protecting those around them.
They didn't talk about having potential immunity from Memory T-cells if you have had a different, prior Coronavirus but they only had limited time. It was really interesting. I would love to be tested in the future to see if I have already had an asymptomatic case of COVID.