According to the provided passages, is Sai Baba's presence confined to his physical body?

No, Chapter 19 explicitly refutes the idea that Sai Baba is limited to his physical form. Baba himself is quoted as saying, "I am pervaded in light and sky; I am not limited to one place." He clarifies his omnipresence by stating he exists in water, land, wood, forests, and even abroad. The text explains that the very purpose of him taking on a physical body of "three and a half cubits" was to help devotees who might otherwise doubt his all-pervading nature. He further illustrates this by comparing his relationship with a devotee to the inseparability of jaggery and its sweetness or the ocean and its waves, emphasizing a non-dual connection with those who worship him with an undivided heart.