@Azzuri0
Since you 'didn't even know it', there should be no question Airbnb delete it.
However, it can be a matter of persistence to find the right person.
Last year it took me the best part of a month to have similar status - 3rd P.B. Review undisclosed at the time of booking - deleted.
In the process I had two more similar ones from the previous year also deleted.
So three altogether in one go.
The confirmation email:
'Due to their reviews containing a confirmed 3rd party booking violation, we have determined it is in our community’s best interest to remove this review because it breaches Airbnb policy. '
In sum, persistence is the key to find the right person in CS to apply Airbnb's own policy.
Best Wishes.