Just a guess here, but the most likely explanation that I can think of is that since there's no way to readily tell if someone has been vaccinated or not, the decision to wear a mask or not would be on the honor system. Her and Fauci's concern isn't so much that people who have been vaccinated will spread the virus, it's more that people who haven't been vaccinated will no longer feel the social pressure to wear a mask, and that they'll be the ones spreading it.
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