They do seem to be suggesting pilot error
the video seems to state:
1) SOP is to unlock at mach 1.4
2) the co-pilot moved the lever to unlock at macn 1.0
"the lock unlock is not to be moved into the unlock position until acceleration up to mach 1.4. Instead, that occurred at approximately mach 1.0"
http://www.bbc.co.uk/news/worl... [bbc.co.uk] (2:50)
I don't know if that difference is significant. It sounded to me like 'we're not casting blame formally yet, but look over here at this pilot error'