When the ATCO called them at 9.000 ft 8 miles out, would this Alt be AGL or MSL?
MSL of course. I guess ( only guess at this stage) and she lost him because of terrain filters on the radar.
Medelin MDE elevation is 7000 ft, so 9000ft 8 miles out , with no power even on flat ground, no chances anyway. ( there are 10.000ft peaks in the area. )
Edit : Just listened to the R/T posted,
the last transmission was :" 9 mil pés, senhorita. Vectores,, vectores." ( 9000ft Miss, Vectors, vectors ..) so the pilot gave the Alt , not the controller it was apparently not visible on the Secondary radar.