This is an instance of what I described in my above comment.
"STOP BUYING MASKS" is not "Masks don't work," especially given the rest of the context of the statement where he's saying they're important to protect high-exposure roles healthcare providers. Which means he's also saying they work.
"They are not effective in preventing the general public" might be reasonably interpreted as "masks don't work", but given that he's clearly saying they work in the same breath, it's a better bet that he means something else.
"STOP BUYING MASKS" is not "Masks don't work," especially given the rest of the context of the statement where he's saying they're important to protect high-exposure roles healthcare providers. Which means he's also saying they work.
"They are not effective in preventing the general public" might be reasonably interpreted as "masks don't work", but given that he's clearly saying they work in the same breath, it's a better bet that he means something else.