I highly doubt its fuel you see in those pics. The A380 takes off with all fuel located in the inboard tanks to minimize wing flex. The wing tanks then take on fuel in flight to optimize CG and reduce drag.
The incident took place 15 minutes into the flight, so they were likely still in the climb phase, and I doubt any fuel would be pumped to the wings that early on, or if there was, it would have been very early in the transfer process, since you can't pump the fluid around too quickly.
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-Scott
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