Yes, you are correct. They are badly drawn posters that tell you how to sneeze and cough like a civilized human being instead of like...oh, I don't know...a farm animal, perhaps.
The pictures (which I assume some ad agency was paid big bucks to create) are comically bad, and the subject matter ridiculous. I also tend to think that the sort of people they are aimed at are exactly the sort of people least likely to read them. That's because they are too busy cleaning their ears with a car key, or scratching their sweaty nuts while standing at the urinal and then borrowing your favorite pen during a meeting.
I've decided to create my own equally ridiculous version. If I replaced one of the posters at work with this one, I wonder how long it would take for anyone to notice?