Can you explain the story of Das Ganu and his attempt to write a commentary on the Ishavasya Upanishad as told in Chapter 20?

Chapter 20 recounts the story of Das Ganu, who undertook the task of creating a commentary on the Ishavasya Upanishad in a simple Prakrit language so that it would be accessible to those ignorant of Sanskrit. This work was titled 'Ishavasya-Bhavartha-Bodhini.' While he managed a word-for-word translation, Das Ganu found no joy because he couldn't grasp the internal secret or deeper meaning of the scripture. As the text of Chapter 20 explains, he encountered a significant doubt and, seeking guidance, took it to his Satguru, Sai Baba, in Shirdi. Baba then told Das Ganu that the resolution to his doubt would be provided by a simple maidservant at Kaka’s house upon his return.