Could you explain the story of Das Ganu and his difficulty with the Ishavasya Upanishad as told in this chapter?

Chapter 20 recounts an incident involving Das Ganu, who was authoring a commentary on the Ishavasya Upanishad called the "Ishavasya-Bhavartha-Bodhini." His goal was to explain the meaning of this profound scripture in simple Prakrit language for those unfamiliar with Sanskrit. However, as detailed in this chapter, while translating it word for word, he struggled because he couldn't grasp its "internal secret," which left him feeling unfulfilled. When he took this doubt to Sai Baba in Shirdi, Baba gave him a surprising instruction: the doubt would be resolved by the maidservant at Kaka’s house upon his return.