That's incorrect, the good part to the series hybrid is you are not limited by the battery charge. After the batteries deplete to predetermined level the ICE (or turbine in this case) kick in to provide charge to the batteries and to run the electric motor.
There are some good arguments that can be had about battery life, and drain on the power grid, but I like this design as a good stepping stone to alternative power for vehicles.
That wasn't clear from the article. Are you saying that the vehicle's range is only limited by the availability to refill with diesel - which is of course widely available in Europe and pretty well distributed in the US?