nbl - you would have to ask them! But consider the sensitivities IF IF IF the cause is "pilot error". That will completely devastate the lives of the two pilots, even if there are plenty of ameliorating factors. Before publicly announcing that, there has to be a degree of certainty that can only be had once a proper investigation, including looking at the CVFDR, has taken place and all the factors (because there will be a number) are identified. So they don't announce it, but by not announcing any technical faults everyone in the industry gets the general idea.