Since we're into what if's, I do wonder the crew's experience on type is.
If the Italians are to be believed, they could have been coming in on an intercept from above, messed up their mode selections hoping for an automatic capture that probably never happened, and ended up with a high ROD (>1000'/min) below the planned approach path close to the threshold, possibly with the spoilers out. That's the only way I can explain the impact trajectory in my head.