I think they're right. The EU as it stands today will certainly add to a deeper new recession. However: They are highly selective in their ratings. They focus on the EU and seem to 'forget' the US (and Great Britain). Both are also deeply in debt and both have no plans to even reign in their spending.
The UK is part of the EU, although not part of the Eurozone (thanks, Soros!).
And the US is doing better than the UK to the extent that it is focussing on growth more than on tax cuts for the rich.