It's all Germany's fault.
This DB doesn't even know 50% of the debt was already forgiven.
I'm sure he is quite aware of the previous debt haircut. Unlike you, he's also probably aware that it wasn't 50% of their debt or anything even close to that. It was a 50% write down on a portion of their debt, much of which was already held by Greek banks.
Before you try and call someone else out for being ignorant you should have your own facts straight.