It sounds like jargon, but I think he means that although he still
supports the forecast of improvements in the euro zone economy, he does
think that if he's wrong, the economy is more likely to be worse than he
expects than it is to be better than he expects. "skewed to the X..."
means "X is more likely to happen".
It sounds to me like Draghi is trying to have it both ways - say the
economy will improve, but also that it is likely to get worse.
--
Cheryl