I've recently done a couple of routes from that book, the short footpath section is eminently rideable and is an old cart track going up to the old quarries, it's another one of those things where it's been wrongly classified but they have to stay legal. The ride as a whole is ok, we added on another climb and descent on the other side of the A6 that was far better than anything in the route guide though
The Holymoorside loop in the book on the other hand is a belter, worth trying. The "south buxton" loop is a good one, lots of smooth miles in the first hakf and insanely technical in the second, plus there's a fabuluous pub in the village.
Oh and the models in that particular book are rather good looking 😉