IMHO to exonerate the crew from blame which this award does implies a known technical failure
No kidding, Einstein
We KNOW it's a technical failure. We KNOW the engines failed to respond to thrust lever movement. We KNOW the residual power was not sufficient to enable them to make the runway and, most importantly, we KNOW this was not 'pilot error' or caused by any misdeed by the flight crew.
What this reward does is recognise the actions of the crew once they were in that situation i.e the FACT that they didn't end up in a completely burning wreck with all on-board dead, rather a written off aircraft and everybody walking away from it.
I'm not convinced we will ever know the real cause of this as it has certainly got the AAIB and the manafacturers truly stumped. This, however, in no way prevents the actions of the crew being celebrated and rewarded. The official report will not change the actions of the crew, which we already KNOW to be beyond reproach when faced with the situation in which they found themselves.