The Citation X has EGPWS that must have warned the pilots about the inappropriate flight envelope in relation to the terrain.
Not necessarily, as GPWS is automatically muted when flaps are set past a prescribed setting and withing a geographical boundary of an airport...they may have met the criteria for this. Otherwise, you would get a GPWS warning for every landing...
Lostourlovedone, thoughts and prayers are with you. This is so very sad!