Is “The official history highlights his political integrity in speaking frankly, while the novel adds many fictional elements to his actions.” true?

The History of Song, Biography of Kou Zhun, explicitly mentions that "after more than a year, the Left Remonstrance Grand Master Kou Zhun was also appointed as the Vice Director of the Department of State Affairs." However, in the Romance of the Yang Family Generals, Chapter 14, he is even said to be "Kou Zhun as the Direct Scholar of the Bureau of Military Affairs," which completely deviates from historical facts.