The crew repeatedly ignored the TAWS system warnings about approaching ground, and even auto-command "pull up" ("Up"),
It is my (limited) understanding that the TAWS warnings are irrelevant. Whatever the weather, if they were to land there, it would have gone off since the AF was not in the database. Their slight deviations from CL or GS were not relevant to that.
The TAWS system had a means of being coping with such airfields, and a system of coping with QFE... however, it could not cope with both (as here).
One could guess the crew belatedly became aware of that, hence the altering of one altimeter late on to maybe convince the TAWS they were doing a QNH approach (the frig we do for QFE Ops).
NoD