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I have only read the bottom of Page 7 as you have mentioned before. Ultimately, I have since found a workaround by just grabbing the app's Width vs Height and determining Orientation that way instead.
At the end of the day I just worry the that Object's Help File is somewhat misleading which led to my mild frustration until I found a workaround.
If the Accelerometer object's Help File claims that "It returns values from 0 to 6 :", and it states that it will return a "1" when in Portrait Orientation, the fact that it returns "1" even in Landscape Orientation is a bit strange...