As soon as you have pressure changes over the airfoil you get different reactions.
But I'm no aerodynamical expert - hence I have to continue to study Davies 
Dani[/quote]
I read Davies some thirty-four years ago, the first edition, I guess.
Perhaps Davies is referring to the sweptback wings of jets. As the speed approaches that of the critical mach, the tips begin to lose lift due to the transversal flow. This shifts the CP forward, causing the nose to pitch down (tuck under effect). I am far from being an expert, but this is what I recall from my flight school days.
Some of these Air Force manuals were written many decades ago and never updated; this could be one of the cases. I have one from the USAF and it contains pretty old procedures and theories.
Rgds