You are seriously trolling.
What are the odds of ice causing both engines to fail at the same time? One I could understand, but not two.
That is the whole point of the investigation
If there was low fuel pressure to the engines caused by a build up of ice, why was this not noticed?
As high fuel flow was not demanded or required until final approach.
Why didn't the PEK/LHR 777 that day also exposed to low temps did not reciprocate the problem.
They don't know, but are probably considering the consequences of two back-to-back sectors in some of the coldest temps recorded for long durations on 777 missions to date.
A mate of mine flying a BA 747 at the same time from HKG said fuel temps were in the amber for some time, but no engines stopped.
Different plane, different route, different design. What is your point?