I think there are plenty of dishes that have pre sliced pork chops or rib eyes. The exception, sure. But it would not be hard to find even one example where this is not a rule. Your position is too brittle to take seriously.
The context of the article is obvious. It's about things like steaks and chops served in an American/European style.
Saying that they can technically be served sliced is to miss the point entirely. This isn't about stir-fry or salads.