Failed to mention that salient point, given the weather though I think it could be rather moot, they obviously didn't see the loom of the light.
The APBSS approach chart had 282 by the first BLKMO (Blackrock) waypoint, and the approach accompanying notes identified Blackrock lighthouse with a height of 310’
The discrepancy would be explained by the lighthouse data which gives 282' as the height of the focal point of the light itself, while 310' would be the the top of the light house.