Isn't this very study an example of one that shows that masks do not offer significant protection for the wearer? Whether or not masks protect others seems muc

Isn't this very study an example of one that shows that masks do not offer significant protection for the wearer? Whether or not masks protect others seems much harder to isolate but there does seem to be lower R^2 values for countries and areas with more normalized mask wearing. Perhaps it is just a correlation (just seeing masks reminds people of the risk and they modify their behavior).