Does the Buddhist text Alankarabuddhi still exist?
This may be a "lost in translation" issue. The term "alankar" usually refers to an instrument or ornament. It also refers to a ritual of rhythmic clapping in Tala. Since the Sutras are traditionally recited in rhythm, this might just be a reference to this practice of reciting the teachings. A modern-day equivalent would be "rap", referring to both the rhythm and the actual text.