Depends of what definition you make use of; the article capital says: "the principal city or town associated with its government". Egyptologists have used another unspoken definition: Where the pharaoh built his tomb and mortuary monuments. In reality the pharaoh and his government resided in several capitals. Middle Kingdom: Itjtawy, Memphis, Thebes. New Kingdom: Akhetaten, Memphis, Pi-Ramesses, Thebes. However, I do not quite understand why the start of the 19th Dynasty in 1300 BC is giving as the "end" of Memphis´ capital status.