Teppanyaki literally means “iron pan”. It’s frying, not grilling, the difference is that frying involves contact to a hot surface, while grilling primarily works via infrared radiation, at a distance. Also, air, but that’s not the primary factor otherwise we’d be talking baking: You can absolutely grill something over hot coals on the beach while the wind is carrying all the hot air away. Baking btw works perfectly fine for sausages.
You’ll see that kind of thing being called a Grillplatte in German but that’s because it’s (at least traditionally) an iron plate you put on a grill, not because you’re grilling stuff with it. Culinary and fixture lingo don’t match up in this case.