Hello!
Is there anyone that can give more information and confirm that?
I can't give you any additional information, but after reading the document in the link I can confirm that the tax is being levied as decided in December 2011. This document is about the formalities of how to collect the money. It confirms again, that all Italian private aeroplanes and all foreign private aeroplanes that stay within the Italian territory for more than 48 hours are subject to taxation.