So, let me get this right, because they screwed up the illegal forward handoff by not completing it, it ceases to be an illegal forward handoff?
ART. 1 . . . Handing the ball is transferring player possession from one player to a teammate in such a way that the ball is still in contact with the first player when it is touched by the teammate. Handing the ball is not a pass. Loss of player possession by unsuccessful execution of attempted handing is a fumble.
ART. 2 . . . Forward handing occurs when the runner releases the ball when the entire ball is beyond the yard line where the runner is positioned.
I see nowhere in Article 1 that says the handing or transferring has to be successful. The important part is "in such a way that the ball is still in contact with the first player when it is touched by the teammate." Furthermore, Article 2 contradicts the notion that the forward handing has to be successful; it is simply when "the runner releases the ball".
A TD on this play doesn't pass the smell test. If you don't rule illegal forward handing, then you better have seen air between the ball and the receiving player's hands, which would make it an illegal forward pass.