Pie Chaser,
Your quote about fuel system requirements seems to fit perfectly with the accident aircraft.
There's no obvious way that a single break in the supply tank filling pipe, or a single failure of a fuel pump or valve would starve both engines.
There is also a rider in the statement: "in at least one system configuration". That seems to agree with Eurocopter meeting the certification condition without any doubt. It's very loosely written, but I'm sure their submissions for certification satisfied it.
If there was something weird going on with fuel, and there was no obvious "fuel tank failure", with plenty of fuel left in the wreckage, then I'm sure the investigators will get to the bottom of it eventually.