Jennifer Maas TV Business WriterNational Geographic announced a slate of more than a dozen upcoming original programs Monday, all of which are produced by the brand but will debut exclusively on Disney Plus — not on the Nat Geo cable channel. But despite the shift, Nat Geo content president Courteney Monroe promised that it’s not a sign that the Disney-owned brand has completely moved away from linear content.“I realize that all of my announcements today were for Disney Plus originals, but that in no way diminishes our focus and investment in National Geographic programming for the linear channel,” Monroe told reporters Monday during Nat Geo’s virtual presentation at the Television Critics Association winter press tour.