Obviously the omission of Blackrock in the EGPWS database is bad, but Blackrock was featured on the more detailed of the 5 charts in the moving map system, which was being displayed on one of the captain's screens. And it is featured with height 282ft on the Operators Route Guide to Blacksod that they were following. So it appears information was there to notify the crew of Blackrock's presence. And indeed the captain had considered an ALTITUDE warning 26 secs before impact as being "a small island" (which it was), so realised they weren't just over flat sea.
But what I really don't understand is why, 10 miles out, the crew had already descended so low as 200ft RA. It seems they had a standard SAR approach mode APP1 selected, which took them down to 200ft, but why? At least so soon?