The six do not describe Israel as "terrorist."
Right?
That is your biased interpretation.
The reviewers obviously saw and studied the film.
http://blogs.telegraph.co.uk/news/alanjohnson/100213410/the-gatekeepers-is-an-important-film-friends-of-israel-must-not-dismiss-
http://www.huffingtonpost.com/jordan-mainzer/is-occupation-sustainable_b_2945811.html