Kojiro NAOKI argues 'that "Shotoku no Sumera" is not a forgery created during the Kamakura period, although the authenticity of the entire text of Robanmei including transcription errors is doubtful' based on the examples in the "Manyoshu" and the official messages written on the wooden plates discovered from the sites of Asukakyo and Heijokyo.
また直木孝次郎は『万葉集』と飛鳥・平城京跡の出土木簡における用例の検討から「露盤銘の全文については筆写上の誤りを含めて疑問点はあるであろうが、『聖徳皇』は鎌倉時代の偽作ではないと考える」とする。