GPWS - I assume this is a reference to how it is moded during landing phases (which I don't know).
Obviously the GPWS does give you Pull Up cues when it calculates the aircraft will impact the ground given a number of variables. Now obviously you don't want this going off when you're landing (you are intentionally flying into the ground), so it will be inhibited somehow (I don't know how this happens) - but an obvious mechanism would be to link it to something like "landing phase", or wheels down.
You can see a case for leaving the GPWS function running whenever the wheels are up, but don't know whether this would still make sense from a Typhoon system perspective - I think this is what TOPBUNKER is alluding to (certainly it is hard to miss the massive great arrow and pull up cue in the HUD when a GPWS event is activated - so if it was tripped it would take some ignoring!).