Return it then. For most of us the difference between GF-5 and GF-6 is really splitting hairs. If you feel like you've been deprived of maximum value on your purchase since you didn't get GF-6, the obvious solution is to return the product and look for one that is GF-6 at a retail outlet.
I suppose it's possible someone out there might have already purchased a 2021 vehicle that specifically calls out GF-6 in the owner's manual, but otherwise, you're wasting more time kvetching over this than the value of the oil you'll be returning. And really, what is the value of your time?
We are not in disagreement I can assure, especially when it comes to valuing one's time versus money. I am just glad that I saw this thread before ordering the product in question. I will definitely be on the lookout for SP/GF6 Magnatec, Edge, or Royal Purple at my local retailers.