This is bullshit, let me tell you. Corruption is everywhere in Italy: North AND South. Public sector AND Private sector. I am Italian, from the North, I lived in Milan for years and I am married with a woman from Rome: I know what I'm saying...
Obviously, being Italian doesn't make me an expert in corruption from a legal point of view, but I am pretty positive to know a bit about Italian mentality and facts confirm that corruption is as common in the North as it is in the South (I can cite my sources, if necessary.)
So even if it isn't ironclad evidence it definitely moves the posterior probability towards 'expert'.