>>3893493You can tell he's not a time traveler because he's worried time travelers will divert the course of history and effect the future timeline, when really they help cause history and became part of the future timeline when they travel back in time. A little lesson on causality there, time travelers actually fulfill history, not change it, that is impossible.
If you are still confused for what this implies for determinism and free will look into a philosophical concept called compatibilism.