The man is sufficiently credentialed to suggest that this is at least a well considered position of his based on his experiences as an economist and finance minister.
He was fired from finance minister of Greece after only a few months on the job for the less-than-braggable achievement of completely sabotaging Greece's recovery and ensuring Greece was the only European country which failed to recover during their bailout process.
He resigned and for good reason and he proved to be correct in all his assessments. You clearly don't know what you're talking about, at least get your facts straight.
He was fired from finance minister of Greece after only a few months on the job for the less-than-braggable achievement of completely sabotaging Greece's recovery and ensuring Greece was the only European country which failed to recover during their bailout process.