Legendary 6 and a half years necromancy.
Though its been 3 weeks now without an answer. It would be good to hear an official response. I will bump and add my thoughts:
Forwarded, yes. Forwarded ports are globaly unique for AirVPN and it's possible to know whose account it's currently forwarded on.
I think the question to ask you what scenario you are trying to avoid was very on point. I very much doubt they'd give out your information to any small fish without a court order (that would be illegal, a violation of GDPR). And if it's a court order it'd need to be in Italy or be enforcable there (ianal). Basically until someone (not you obviously) angers some very big pockets, the privacy should be safe.
If you want to be sure, rotate the forwarded port every 24 hours. Better yet, every time you connect (assign port) and disconnect (remove port). AirVPN has an API, use this unique feature to your advantage.
As requested though. A Scenario:
Let's say I host a website on a non-default port (port-forwarded) with satire and comedy of a certain Winnie Pooh and R. Dogan political leaders. Somehow they visited my funny comedic website but didn't find my short stories and comics about them funny and cried (a lot). They decide to sue AirVPN for identifiable information. The port is still tied to my account. Obviously AirVPN has no obligation to respond to Winnie Pooh's country's court system, but what if Mr. Dogan manages to get a court within the EU to issue an order?
What if that order is issued in Italy vs. Non-Italy (EU member state)? In what case will AirVPN cause indirect harm to an aspiring comedian and disclose information?
Can the comedian hope to be notified by AirVPN of this fact?
(A non-question: can an AirVPN admin miss the button and accidentally click "unbind port" instead of "pwn user" button? Mistakes can happen, right?)