At its worst, [a thesaurus] is a crutch, for crossword enthusiasts, students desperate to imply a little learning in an essay crisis, headline writers, nervous after-dinner speakers and, yes, journalists.
Headline writers and journalists? All the headline writers I've ever met have been journalists. Perhaps Ben Macintyre, who is the author of this piece, means 'headline writers and other journalists'.
In the same way, it bugs me when people (including some of my colleagues) refer to 'production staff and journalists'. Sub editors and designers can be journalists too!
Wikipedia agrees with me on this.