It doesn't. I'm just saying you can't hold an author responsible for being able to accurately prognosticate every trend in technology, science, politics, fashion and religion accurately enough to hold their timeline in lockstep to reality.
Technologically, there is no good reason we couldn't have had a moon base in 1999 and a ship in Jupiter orbit by 2001. We chose not to do those things.
Kubrick and Clarke chose 2001 because it is the first year of the new millennium and near enough in the future that audiences would have a personal relationship with this future that is near enough that they would live to see it themselves.