I have read the article in the link. I am suspicious that the politicians were only too happy to follow the conclusions of the false figures produced by the so called economists Carmen Reinhart and Kenneth Rogoff because it suited their purposes in producing cut-backs. These cut-backs enabled the politicians to reduce spending on the public sector in particular because they wanted to tip the balance of European economies towards the private sector. This desire for privatization was purely political and idealogical.
I never believe the figures produced by economists especially in forecasting the future, because I don't think economics is a science. It may have the trappings of a science in the form of charts, diagrams and spreadsheets but it is purely political propaganda.