The way I read it, Nunn's quote does not contradict what I wrote. But maybe you don't agree with that, so let's see what some other respected authors have to say.
Quote:It would be impossible to illustrate even a fraction of typical positions and tactics that arise from the Benoni. My object has been to discuss these when they arise in concrete positions throughout the book. Nevertheless, let me comment upon just a few prototypical structures and strategic themes for those who are new to this opening. (There follows four pages of examples.)
--Watson (2001) The Gambit Guide to the Modern Benoni, page 10
Quote:The Modern Benoni is a sharp opening to employ, but that doesn't mean that there aren't a number of important strategic ideas that frequently occur in it. A knowledge of these is useful, although one must always be careful when implementing a common plan, for fiendish tactics are never far from the surface in the lively world of the Benoni. (There follows 50 pages of the Strategy chapter.)
--Palliser (2005) The Modern Benoni Revealed, page 46
Quote:It is impossible to list here all the typical tactical and strategic motifs for both sides. ... There are seven main chapters in the book, and there is a description of the contents at the beginning of each of them. At the end of each chapter I sum up the most notable plans and tactical motifs for each side that we have seen in the games and their notes. In these conclusions we shall see that many plans for both sides appear time and again, but the evaluation changes: a plan is not always good; it depends on how the forces are deployed. ... (There follows Chapter One - The Classical Variation.)
--Franco (2007) Chess Explained: The Modern Benoni, page 5
When I used the word "dynamic", this was short-hand for the strategic factors being dominated by the tactics, at least from black's point of view. So reference to strategy without actual variations is quite misleading. None of the three authors I quoted makes this mistake, in fact they explicitly mention that concrete variations are important. I no longer have Nunn's book, but I recall that he also leaned heavily on tactics to justify black's opening. If you ignore the tactics, black's position can be quite depressing.