The magenta is part of color-coding (CYAN / WHITE / YELLOW / MAGENTA), nothing to do with managed. The thumb rule is nice, but coincidental. See later MODs with green yo-yo.
ILS approach is a Precision Approach using ground-based NAVAID. The FD and AP are coupled to this signal. There is no guidance from the FMS and thus neither any managed nor selected guidance terminology or technique apply (that's for NPA approaches that cannot be coupled - which this is not).
@RumBear: On which type of aircraft did you fly ILS APCH before the Airbus?
Last edited by FlightDetent; 24th Jan 2017 at 10:59.