Well nobody has complained, so... ;-)

The site guide only states–
‘The Modern Antiquarian is primarily concerned with megalithic sites and the ancient i.e. prehistoric landscape.’

I can’t speak for Holy or anybody else, but my reading of 'prehistoric' is generally pre-Roman, so Iron Age seems fine to me. The bottom line would seem to be that if it's of interest to you, then it will probably be of interest to someone else.

I say keep it in. :-)

-Chris