I had the same question and spent a little time trying to figure out what Alwyn intended. I didn't get this from any of the authors, but here's my take.
The word "snatch" certainly implies explosive speed, but the exercise description in the book doesn't say anything about speed, momentum, or explosiveness. It says, in part (p. 207):
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Without changing the angle of your upper arms relative to your torso or to the floor, rotate your arms so the weights rise up to about the level of your ears. Make sure your elbows stay bent 90 degrees.
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That doesn't even imply explosiveness to me when I read it. In addition, p. 169 tells us that this exercise is Alwyn's version of the Cuban press. The Cuban press is not an explosive movement. The "L" of the YTWL is described on p. 210, and in that description Lou writes, "The movement is exactly like the prone Cuban snatch." We know that the L is a controlled movement.
So, in the end, I came to the conclusion that it's really just a misnomer. It's not a snatch at all; it's a prone L. If I'm wrong, I'd like to be corrected. It'd be easier, and more fun, to do it with explosiveness. I used a controlled rotation when I did this exercise.