The first sentence could either be parsed two ways which yield opposite meanings or is grammatically incorrect. I can't decide which, but in any case you have a point. The first sentence was supposed to mean that the Greek economy was in bad shape and everyone knew.

To argue a point means to advocate for it. Your statement was unambiguous, and meant what you meant it to.

I apologize. After re-reading, I see you are correct. Pardon my earlier post(s) on the matter.

To you, perhaps. Not to all. Which makes it not unambiguous.