Well, then it must have been a localization error...
The printed manuals that came with the MDD clearly stated PowerMac, without any space, and they looked optically very differently than this PDF.
By the way, because af the 2 main administrative languages in Luxemburg are German and French, the models sold here are Swiss ones, which come with German and French documentation, and a keyboard that makes typing those two languages easier, without switching keyboard layouts.
So maybe it was only in the German and French docs, but I definitely remember it being written without space, and not just for the MDD.
Anyway, does it really matter?!?