Question: is sahelanthropus metal gear rex?
Answer: In the "Making of a PV" video, Hideo Kojima described Sahelanthropus in the hangar as Metal Gear REX, presumably to avoid revealing plot details prior to the game's release. The name "Sahelanthropus" and reason given for the name within the game represents an anachronism. The Phantom Pain takes place in the '80s.