On the contrary, if you complete the challenge, you either can receive a trial card, or an unlimited, non-actionable version of the card. I've seen someone get the actual card on Twitter, but it's random.
You don't have to earn a triple double to earn the card either, you just have to complete the game, especially since it's 3 minute quarters. I ALMOST got the 60 points along with the triple double from the challenge though (I should've got the full card for getting so close!)