One appeals court said it was wrong and another said it was right. Now it's up to the SCOTUS to decide.
IMO, the 5th circuit got it correct. "A wrong answer on the form would be deceptive only if intended to conceal an otherwise unlawful transaction"
I'm not a lawyer, but here is how I would argue the case. Mr. Abramski WAS the buyer. He then sold what he purchased legally to another individual (his uncle) in a separate legal transaction. Case closed. If Mr. Abramski's uncle was precluded from owning/purchasing firearms, then Mr. Abramski would not have actually "sold" the gun to his uncle, in which case, he would have actually been the one doing the purchasing for his uncle.