It's not DLC though. DLC usually means you HAVE to buy it in order to be able to enjoy that part of the game, or else you are shit out of luck with only the base game.
All these ships will be available to the person who paid $30.00 for the game. You don't have to pay a penny more if you don't want to.
So as far as I understand what dlc is, this isn't it.. it's just perks of having another ship at the start of the game for those who want to help fund the development with more money. Those ships can be earned in-game through normal playing.