I'm troubled by the idea that Baba left his physical body. How does the text reassure devotees that he is still present?

Chapter 43 offers profound reassurance by explaining that what seems like death is an illusion, like an eclipse which is merely a 'defect of vision.' It states that Sai Baba, for the sake of his devotees' salvation, voluntarily 'burned the body in the fire of Yoga' and 'merged himself into the unmanifest.' Crucially, the text emphasizes that he 'stayed in the hearts of the devotees' and continues to fill the entire 'moving and non-moving world' in his true form. His task for the devotees is not over; he is still the 'protector of the devotees' cause' and 'always keeps the devotees awake.'