Having listened to many interviews by Musk I think he does believe his timelines, in the same way a football coach believes his team can win the Superbowl. They

Having listened to many interviews by Musk I think he does believe his timelines, in the same way a football coach believes his team can win the Superbowl. They're meant as a goal to be striven towards by himself and those working under him, not as a cold, neutral assessment of the most likely outcome.