RSGB IOTA website explains:
In a news item dated 6 June 2012 we reported that, following confirmation that the only two islands listed as qualifying for EU-155, Baron and Scanno di Piallazza, no longer existed, we would withdraw EU-155 from the list of valid IOTA groups and amend scores down. This we have now done. However, in view of the very fragile nature of the environment we have retained the QSO information on the database in a non-counting format in case the situation should change with one of the islands reforming. We will review the position periodically.