I mean, you're talking to a guy who started an entire thread around the question of what teams should do when they're driving late down 10 and get into FG range, when the obvious answer is "They should prepare to lose." I wasn't joking when I said I enjoyed debating between two low-percentage options. IMO, it's the scenario that's fascinating, not the effect on the outcome.
Anyway, I was watching the play again today and, while Dak should definitely have handed it to the umpire instead of trying to snap it, the umpire was nowhere near Dak when he went down. He didn't make it to the LOS until the moment he bumped into the center. Given how close Dak got to getting the snap off, waiting until the ump got there and handing it to him might have made a difference, but I can't be sure.
Point being, it was such a high-risk play that I'm not sure you can just say, "Eh, bad execution." The mistakes they made were inherent to the risk they took: not having enough time left when the play started, Dak taking a few too many yards, not knowing to hand the ball to the ref, etc.
But yeah, in terms of stupidity, the post-fake punt alignment was way worse