Had he followed his training and flown pitch and power then this is just one of dozens of similar incidents that plagued the 330/340 series.
Pitch and power isn't the only thing one is trained in (granted, it's a core fundemantal)
Was what his training?
What was his currency?
What else was he trained to do?
Did he receive any negative training?
Why did his instrument scan break down to soon?
What element of his training, or lack of it, or lack of
recency in training, factored into that?
(I am making an assumption that the PF's instrument scan broke down early in the event, as evidenced by his climbing 3K or so without ample correction well before alt change went that far. If my assumption is off, so be it.)