Interesting, the autothrottle wasn't mentioned at all in the preliminary report. 

But it's pretty easy to tell it was disabled at some point (or never enabled?). The report does say the throttles remained at 94% throughout the entire flight; You know what the autothrottle does? It constantly adjusts the throttle trying to maintain the set speed.

If the autothrottle had been on, it would have reduced the throttle to avoid overspeed.