Can you explain the theological concept from Chapter 43 that Sai is the 'Supreme Brahman' and the world is an 'illusion'?

In Chapter 43, identifying Sai Baba as the "complete Supreme Brahman" is a profound theological statement about his true nature. It means he is not just a physical being but is one with the ultimate, formless, and eternal reality of the universe. The assertion that "the world is an illusion" is a direct consequence of this truth. From this advanced philosophical standpoint, the material world and its phenomena, including physical bodies, birth, and death, are seen as transient and not ultimately real compared to the unchanging reality of Brahman. For a being who is Brahman itself, the chapter argues, there can be no consciousness of the body or susceptibility to physical ailments or death, as these are all part of the illusion.