Uh... Case in point about reading stuff. The first place I looked for more information about Appletalk was Wikipedia. Almost the first thing it says there is "AppleTalk was not built on the archetypal Xerox XNS system, as the intended target was not Ethernet". It also confirms that Localtalk was a RS422 serial network.
In fact the Apple Lisa was the machine that took ideas from Xerox PARC. Appletalk was part of the Macintosh project.