For purposes of the specifications for IFR GPS avionics, the
"approach" is *only* the final approach segment. The other segments
are terminal routes, and use terminal CDI scaling/sensitivity/RAIM.
Only the approach mode uses approach scaling/sensitivity/RAIM.

None of that is relevant. You're talking about how this stuff is
stored in the database.

The directive to pilots is that only approaches labeled "GPS" can be
flown with GPS. The word "approach" clearly refers to a pilot's
understanding of what an approach is.

Got a phone number for the guys that write this section in the AIM?