I'm not arguing the line isn't subjective.
But, if it's not made with the same ingredients, or for example isn't actually food (as with many marketing images for food), then it's deceptive. I hope you agree?
If it wasn't even made in the restaurant you're in, then I'd agree that is more of a blurred line - if it was made with the same equipment, to the same standards, by the same company, that's reasonable.
I think my point still stands that truth is essential if the mechanism of market forces is to be at all effective.