I also agree with the assessment of this as "dated biassed crap".  And quoted without context it is not helpful, so quite right to delete.  At the same time, it give a very interesting piece of evidence for what some of us have been saying all along, namely that the phrase "dark ages" has been questioned by cutting edge scholars since the beginning of the 20th century.  Here we have a reactionary view from 1929 expressing irritation with the modern view.  I wonder whether we couldn't usefully put McCabe in as a footnote further up in the modern scholarship section?