The poster doesn't actually matter the contents of the post do.

In 10 months Ferriters book sold 1,711 copies or 171 a month. Coogans book sold 8,000 in two months thus 2,000 per month a difference of some 2,300 percent, or 23 books to every one of Ferriters.

Taking this into account AND the long running feud between the two writers it is unlikely that Ferriter wrote a reasonable critique of his rival.

In fact Ferriters review was called "the bitchiest review of the year" on Politics.ie.