Suikoki' has a lot of incorrect Chinese characters, and errors in the meanings and the use of Chinese characters in the Chinese writings, which is the reason for criticizing Oyama who insists that 'Suikoki' was written by Doji, who had studied in China for 17 years.
「推古紀」は漢字、漢文の意味及び用法の誤用が多く、「推古紀」の作者を17年の間唐で学んだ道慈とする大山説には批判がある。