Convienient that any of the alledged ice would have melted pretty quickly. There is no other explanation.
If so, evidence of this would have been found somewhere in the engine feed lines, FOHEs or fuel filters in the fuel delivery system, which according to the AAIB reports released sofar, is not the case.
To quote the September 2008 report:
The samples from engine fuel filters and housings contained a small number of very small droplets of water. These droplets could have resulted from the ingress of fire fighting media through damaged engine components, or might have been free water, which naturally settles in this area.
No cover up, just lack of evidence to prove one (ice) of perhaps several possible hypotheses. It takes what it takes to come to the right conclusion. The final report will most likely not be released some time soon.