Is “Depicted as dull and weak, tricked by Zhuge Liang over Jingzhou” true?

In the Records of the Three Kingdoms, Book of Wu, Biography of Lu Su, the single-sword meeting is recorded as Lu Su taking the initiative to invite Guan Yu to meet and personally rebuke him for not returning the three commanderies, portraying Lu Su as a tough diplomat; in the Romance of the Three Kingdoms, this meeting is rewritten as a highlight of Guan Yu's solo sword meeting, while Lu Su becomes a loyal and kind simpleton manipulated by Zhuge Liang. (Original text: 「肃住益阳，与羽相拒。肃邀羽相见，各驻兵马百步上，但诸将军单刀俱会。肃因责数羽曰：“国家区区本以土地借卿家者，卿家军败远来，无以为资故也。”」——Source: data/raw/sanguozhi/吴书·周瑜鲁肃吕蒙传.txt)