Yes they do. And they work for more than COVID. It's fact that has been proved many times over for centuries.
You refuted the article that described a population, not a "person".
I'd hope you're not dumb enough to think the article described a single person as being between 99% and 100% vaccinated.
DID you think the article was describing a single person as being more than 99% but less than 100% vaccinated?
Aggressive in your ignorance/
troll - a person who posts or makes inflammatory, insincere, digressive, extraneous, or off-topic messages online
Perfect examples of trolling: "More proof the mask was pushed on everyone out of fear. Just like all the people who do everything they can to live longer... to delay the inevitable. You are going to die no matter what you do just like catching COVID. You can "slow the spread" all you want but that won't stop you from catching it."
You are all going to die eventually, therefore masks don't work?
That's idiot logic if ever there was.