However, certain parts of his accounts are considered dubious by modern scholars, with some conjecturing that he simply concocted his stories by using written accounts of China penned by other authors such as Odoric of Pordenone.
Cu toate acestea, anumite părți din relatările sale sunt considerate dubioase de către istoricii moderni, unii afirmând chiar că poveștile sale sunt inventate utilizând scrierile despre China ale altor autori, cum ar fi Odoric din Pordenone⁠(d).