How did the boon given to Shri Sayandev directly influence the writing of his descendant, Shri Saraswati Gangadhar?

According to Chapter 0, Shri Sayandev received a boon from Shri Narsimha Saraswati Maharaj that "My constant service will be performed by your descendants." The text then identifies Shri Saraswati Gangadhar, author of the famous Guru biography, as the fifth descendant in this lineage. The provided excerpts establish this direct ancestral connection and a familial duty of service. However, Chapter 0 does not explicitly detail how this boon directly influenced the specific style, content, or narrative choices within Saraswati Gangadhar's writing, other than implying that creating the biography itself was a fulfillment of this inherited mandate of service.