FYI, it seems that it's possible to enter this GA even when missing the base game (not 100% sure as I do have it, but the store page doesn't state "This content requires the base game", the GA isn't sorted as a DLC GA, and the GA has significantly more entries than your other 2 DLC GAs). Kind of like this one: https://www.steamgifts.com/giveaway/dF3HE/f1-2017-1988-mclaren-mp44-classic-car-dlc

thanks!! 😃