Ibn Khaldun's philosophy is still valid in this timeline. Maybe in all timelines, but definitely valid here.
The author, whether it be the "historian's" persona, or the human behind the avatar "volksmarschall," is obviously a devotee of Ibn Khaldun.
And on this note, anyone who has read Ferdnand Braudel will also know why this "history" is making so many seemingly odd references to great figures of the past, mythology, ancient history and other such things, while describing a history that roughly runs from the middle 15th century to the beginnings of the 17th century. Tour de force: Alexander, Augustine, Machiavelli, Ibn Khaldun; Achilles, Hector, Aeneas, and Turnus...who's next? Who has read enough classical literature to see what other (formerly) famous figure will appear to help our narrative along?