The holes are two spirals. You need a spiral pattern so that the LEDs can be spread far enough apart—and you need two of them because if you divided up the 360° of the panel into 16 compartments only 22.5° across, the LED wouldn't give even illumination. So instead there are 8 compartments 45° across and there are two LEDs in each of them, one for the inner part and one for the outer part.
A classic Nipkow disk, like in the Baird television, has a single "compartment", because it is supposed to scan a rectangular raster. Only one hole passes over the raster at a time, and the light that illuminates the whole rectangle evenly is modulated. If you add more rasters around the diameter of the disk, you can produce a much larger image, but there will always be a hole in the disk's center. This requirement for multiple rasters has an impact on the disk's resolution, though, because instead of only one hole passing over the light, every hole in the disk is always lit. So you need a separate light source for every hole, which is very different from Nipkow's conception.