I guess whether you call it a lie or not is a matter of framing, but I thought that the official line was always the same, even if you had to search hard for it: masks don't offer much protection to the wearer but do protect others from the wearer.
I seem to remember this being the justification for advice given a year ago. The difference is that a year ago they emphasized the first part and now they emphasize the second part.
I seem to remember this being the justification for advice given a year ago. The difference is that a year ago they emphasized the first part and now they emphasize the second part.