I am sure that is correct for some, if not many.
For others, their own pressure to do better is all that they need to motivate themselves to improve. I guess that could be considered self competition, if a guy wants to think about it that way.
Different people get motivated differently.
I think the pressure he is talking about goes beyond the psychological motivation to practice, and refers more to the adrenaline-packed “fight or flight” response that comes with time pressure, an audience, and competition. IME, it’s very real, and closely approximates the moment-of-truth feeling of finally finding the game animal that you’ve been looking for, and having to make the shot in limited time.
