Pffff ridiculous. Can we starting calling this the Godwin's Law of economics? Economic policy intended to rebuild an entire continent after the most traumatic conflict in its history is necessarily going to differ from policy during times of peace.
Not him but if I were my answer would be: not just a joke but a rather clever comment about the logic behind the idea that Greece would be more deserving of debt-forgiveness if they started a war on top of the current situation.