Can you explain the philosophical concept of birth and death as "false imaginations" mentioned in the source?

Chapter 43 presents a profound philosophical viewpoint where birth and death are considered "false imaginations" for enlightened beings. This is because such saints, who incarnate by their own will for the welfare of devotees, are not bound by these events. The text defines birth as the union of body and senses and death as their separation. However, for those who have realized their true form and are one with Brahman, this cycle is illusory. As Chapter 43 articulates, Sai is the complete Supreme Brahman, for whom the world itself is an illusion, so the consciousness of a body subject to birth and death does not exist. Death is compared to a solar eclipse—a defect of vision for the observer, not a change in the sun's essential nature.