This doesn't look quite right, even for a pre-release version. Two points --
1. The document says that the display is 800x600 pixels and each pixel is 151x153 microns. If this is the case, then this display is /exactly/ 90.6x122.4mm. So why devolve to the inch approximations when producing PDFs?
2. Creating a PDF with these dimensions does not optimally fill the screen-space. Although those are the dimensions of the overall display, the status bar at the bottom of the screen alters the aspect-ratio, which someone else on this forum pointed out can be reverse-engineered from the images which come with the device. Toss in the fact that there does seem to be a 1-4px border on each side, and the usable area is probably down to 90x115mm.
What I'd really like to see in a document like this is a micron-accurate measurement of the usable display area. :-)