Are there any Guru biographies mentioned that were written by the Gurus themselves?

Yes, the text does mention a Guru biography written by the Guru himself. Chapter 0 recalls a detailed and scholarly work written by Shri Samarth Sadguru Tembhe Swami, also known as Vasudevanand Saraswati Maharaj. However, the text explicitly states that because this biography was written by the Maharaj himself, it cannot be categorized with the Guru biographies written by devotees like Shri Saraswati Gangadhar or Shri Annasaheb Dabholkar. This distinction highlights the unique nature of a Guru authoring their own life story, setting it apart from works written by followers.