Elon Musk is not Kennedy. His default style of speech is less political and usually not aimed at inspiration.
You can draw no inferences about his confidence from this comparison.
What you could take from this comparison, if you were so inclined, is that when it comes to inspiring Americans about space travel, Musk&Co. are less motivational than what worked in the past. Time will tell if you need the same motivational leader to accomplish something like this in the private sector.
Kennedy was also assassinated. There is likely a direct link between how inspirational he was and the fact that he was assassinated: Jesus was crucified, Joan of Arc was burned at the stake, and Dr. Martin Luther King was shot. If Elon Musk wants to get the task done without ending up dead for it, speaking in a less inspirational style may be the better path.
Edit: It's a completely serious observation, not intended as funny at all. Anyone care to explain the downvote? Or argue the point?
You can draw no inferences about his confidence from this comparison.
What you could take from this comparison, if you were so inclined, is that when it comes to inspiring Americans about space travel, Musk&Co. are less motivational than what worked in the past. Time will tell if you need the same motivational leader to accomplish something like this in the private sector.