If you are going to barbeque for a dozen or more people, the pre-made patties are much more convenient, particularly because they will take the same amount of time to cook.

So if that's a thing you only do every once in a while, you are a prime candidate for confusing advertising. You don't already know what the thing you want looks like, and you probably weren't expecting the ambiguity, because "meat" has meant one thing for thousands of years.