Sure there is some debate about a possible debt from Germany to Greece for crimes committed in WW2. That's a big discussion by itself. Doesn't change the fact that the original article ignores the Marshal Plan.

Anyways if Greek was not in the Euro it could devalue its currency. Which would benefit their exports, if they had any. However their debt would still be payable in Euro and the new currency would have a terrible exchange course. So no win. There are scientist who say the real estate market might boom in such a case. Since most Greeks are home owners that may provide some cash in the short run: International investors and rich Greeks who transfered their assets out of the country before the crash will buy in.

It's still unclear if a state can actually default. I guess if you're not dependent on import you could risk not paying back your international partners(/enemies). There are examples of countries regaining some power in isolation.

I agree about the risk of lending money, that's probably the reason why so much of this money was used to decouple Greece finance market and ensure existing (private) contracts were honored.