I know this has been discussed on the Marilyn yahoo list earlier this year. There was an answer (indirectly) from John Nuttall that they had surveyed it as being 13.5m and therefore outside their definition of 'top'.
But is that for the point that is listed in the 'deleted tops' section as the 622m spot height at NY770198 (and is labelled as 'Long Fell'😉? There's a higher spot height of 624m further to the east (NY775199).