Looks very much like high onset rate g-loc to me. You can see a very aggressive increase in pitch rate as the nose reaches the vertical, presumably just as the GPWS triggers realisation of the situation; after a couple of seconds the pitch rate inexplicably drops to almost nothing. Onset as rapid as that causes g-loc with no warning symptoms, and there is no way that the pilot was 'playing the level off' when spearing through the minimum height like that. Notwithstanding, the primary cause appears likely yet again to be a missed gate on a rolling/vertical combination; yet again display flying takes its toll.
Last edited by Easy Street; 24th Sep 2017 at 20:23.