Lots of rifles that will shoot 3 rounds into 1 MOA everytime unless the shooter fouls up. Less that will do it with 5 shots but there are quite a few that will. When I hear, or read the phrase "1 MOA, all day long" I don't take it literally, and I don't think the person who said it meant it to be taken literally. I'm not easily offended and understand what is meant by the comment.
I have several rifles that will shoot MOA or better every time as long as I don't mess up. But if I mess up that is not the fault of the rifle, it will only put them where I point it. There is a difference between "this rifle will shoot MOA, all day long" and "I can shoot MOA, all day long".