Based on that drawing, I'm not sure how this could be anything other than a peninsula, regardless of the covering (drywall, cabinets or panels) under the countertop on the seating side. I don't think I've even seen any peninsulas with cabinets on three sides. One side is cabinets, the second the paneled end, and the third side usually bar seating. To me it sounds like he's pulling definitions out of his hat.