Yes, that reference agrees with other descriptions that I've read.
There are 3 positive axis (L,A,S) and all indexing moves in
the positive direction. The orient values 0,1 and 2 specify the indexing order.

As I understand it, the orient values 3-6 were only meant to be used
for animation so I've always ignored them
(see [www.mayo.edu] and [eeg.sourceforge.net]).

The latter reference states:
"The flipped orientations (orient values 3-5) are only defined in Analyze to support a movie animation. The flipping is not done in the slice direction, but rather in the dimension that suits raster graphics. The flipping has NO relationship to the actual orientation of the volume, only to how the data is handled during graphics processes. Thus, orient values 3-5 are NOT recommended. "

John