You know someone pulled those requirements from their ass, right? There are no official recommended requirements because the game is still in alpha. There is no way for anyone to actually give accurate requirements of a game that isn't even optimised yet. Whatever the actual final game requires to play with good quality, people will be ready for it.
That said, there are always games with settings that are very demanding at launch, that get few people can enjoy. Crysis was one of these. Metro 2033 too. Star Citizen will be as well. But that doesn't mean you won't be able to play it smoothly with a more medium range PC. You won't be at high - ultra settings. Medium - high will be just as an enjoyable experience.