For those who haven't noticed yet, there's another video up, of the Curtis/Zach top 4 match. The video is pretty grainy, so here's a walkthrough of what's going on.
https://www.youtube.com/watch?v=LeJM-tq2Rnk
(Partially ninja'd by Flare, but I hope the walkthrough is still useful. Hi Flare!)
Start at 18:15 and notice Curtis making three piles; the top pile is energy, the middle pile is pokemon, the bottom pile is trainers. Starting at 19:03, he pile shuffles those stacks into four piles; at 19:30, he puts those piles on top of each other without riffling or mashing them together, and begins another four-pile shuffle. At 19:56, he puts those four piles on top of each other, again without mixing them at all; at 20:05, he cuts the deck once; at 20:07, he presents the deck to his opponent. This is a double nickel, except with piles of four.
(Zach's shuffling technique is markedly different from his technique in the video that was discussed earlier, and may also be worth a watch for that reason.)
Game 2 ends at 43:04. Curtis proceeds to make three piles, one of pokemon, trainers, and energy, while Zach pile shuffles without looking at his deck. At around 43:50, you can see Zach shuffle the individual piles of his pile shuffle together, while Curtis is nickeling again. At 44:15, Zach is still in his pile shuffle with extra shuffles, and Curtis starts the second half of the nickel. At 44:38, Curtis's pile shuffle ends, AND Zach starts looking through his deck. At 44:45 Curtis presents without even cutting, while Zach continues reordering his deck. At 45:30 Zach starts riffling again.
You can hear what I assume a judge is saying starting at 50:15, though, which is pretty awesome because we no longer need to rely on hearsay. At 51:18 Curtis describes the shuffle that he is doing: "How I do it is I map it out so it's like trainers, energies, pokemon, then I do four [piles] and [unintelligible]." At 52:15 the a judge says "Me and Dave were both here, and we believe that you shuffled it enough, randomized it enough, what we want to tell you is, just make sure that if you do it, you're shuffling a lot after." Curtis: "So do you want us to shuffle our decks?" Judge: "No, it's fine, we believe that you've shuffled enough." Later: "There's not going to be any cautions or warnings, it's just kind of like a verbal thing"
I'm not the most experienced judge, but I do not think that is how I would have ruled.