I think it's misleading as, although the IAA ay be responsible for the aeronautical information on their charts, the actual topographical map will have come from Ordinance Survey Ireland. Where the digital database for the EGPWS comes from is unclear but, given that it will be the same as the Fixed Wing variants it is not a huge surprise that it does not have the level of detail that would include rocks in the sea. The greatest acuity is in the vicinity of airports.