How does the beginning of Chapter 18 describe the supreme nature of the Sadguru?

The start of Chapter 18 offers a profound description of the Sadguru, hailing him as the "supreme Eternal one" and the "Truth of Brahman." It states that the Sadguru shows the world to be an illusion through direct experience and is the "Ruler of Maya." The text describes him as beginningless, endless, and beyond duality. Furthermore, Chapter 18 highlights the Guru's unique ability to effortlessly point out the "Unperceivable One," a concept that even the Vedas and Shrutis debate endlessly, to his devoted followers.