The book is official, but some recipes need too many tolerated items and there are photos showing non-Dukan foods (so obviously not a photo of the actual finished product).
However, I've not looked through the whole book (saw a Daily Mail article for my examples) - and it wouldn't put me off if I wanted to buy it - I'd have a good look in the shop (I've never cooked all recipes in a book but if 80% seem good, I'll buy it) but I do think there are plenty of recipes around here or on the net, with feedback as a bonus - that's the main reason I wouldn't bother.