Not suggesting this was the cause of this accident, however mention of glideslope capture from above rattled around in my brain recalling a safety warning published a couple of years ago which I have managed to find:
Unexpected autopilot behaviour on ILS approach when intercepting the glide path from above based on a 2013 event at Eindhoven (
Pitch Up Upsets due to ILS false Glide Slopes ).
Both worth a read.