I don't know.. I looked as close as I could, and I don't think those are cutouts. I thought so at first too, but if you look super closely the grain of the bottom ply seems to go through the different colours on the edge, which would suggest that its a fancy stain trick/colouring instead of a cutout.
I thought it would be cool, but what would be the point? And wouldn't it kind of weaken the deck?