Hello Max Angle.
A few months back I landed on the new runway down at Hurghada which was not at the time in the EGPWS database although it was to be found in the MCDU. Following Company advice (in very small print it has to be said) I switched off the TERR function of the EGPWS and landed without incident. Following us in to land was a colleague who hadn't spotted the advice and whilst coming in to land had had the 'full monty' of "Terrain Terrain" etc. It was CAVOK so he landed anyway.
I guess that's an indication at least that the EGPWS is a self contained system with its own database and probably isn't too worried about ILS signals when considering runways and terrain (ILS glideslope a being a different function).
BTW, where did the link to Goldenrivett's diagram go from the response to my opening post?