It's misleading. Even improvised masks will reduce the chance of asymptomatic carriers spreading the disease, thus reducing the chance of the general public c

It's misleading. Even improvised masks will reduce the chance of asymptomatic carriers spreading the disease, thus reducing the chance of the general public catching it. Note the "general public" language in the tweet. Even if there is a way to parse that tweet that renders it technically correct, it's still phrased in a way that is certain to mislead a lot of people.