Not a great shuffle tbh. Bottom cards are still on bottom, top cards are still on top. Ofc in a slightly different order but, if you know generally what's on top, and that's what you want, then they're still there.
Ah yes, the shuffle where you take the bottom half of your deck and merge it with ~40% of the other bottom to know the top several cards, still in palm placement, is knowing where they’ll be. So is it shuffling problems or slight of hand?
That's very impressive. Looking it with a modern stand point, I think how fast hw almost do a flower as a 1st move to his shuffle and how fast and neatly he can divide 5 stacks of cards- it's very very amazing. Never seen someone do it like that and that fast