Some even have pages that are NOT violation of Wikipedia's notables policy, but that would barely fit Wikitree's ideal of notability without a Wikipedia / Dictionary of Biography / other similar page. (Just check some Olympians. They qualify on Wikipedia, but many (most?) would not necessarily qualify on Wikitree.)
The "must fit the criteria for a Wikipedia page" is the base minimum to decide if a person is notable on Wikitree. (Note, the criterion is not that they must have a WP page, but must qualify for one.) It is then up to the Notables Project, or the Wikitree community, to decide if they really are notable if they don't have an actual Wikipedia page / Dictionary of Biography entry / other qualifier.