The presence of fuel in the tank does not completely rule out mismanaged fuel. What happens between the tank and the engine, and if selectable might not be apparent to the investigators, i.e. not on the FDR.
There is evidence (or inference) that with the fuel metering valve open there was insufficient fuel flow to accelerate the engines; thus whatever is in between, could be mismanaged either manually, automatically, by design, or unintentionally.