Kebechet makes it clear they know who Ashitaka is, though they deny any knowledge of who Xici is repeatedly. If asked, they'll say that erasing a single person from history, especially an important, pivotal and royal person such as Ashitaka, is a violation of the Windhoek Accord. Kebechet will give the impression they don't believe Ashitaka about someone being violently erased from time. Are they sure their memories haven't been tampered with?