How does Chapter 43 philosophically define birth and death, and why doesn't this apply to a perfected Yogi like Sai Baba?

Philosophically, Chapter 43 defines birth as the 'union of body and senses' and death as their 'separation.' For most, this cycle is an inescapable reality. However, this definition does not apply to a perfected Yogi like Sai Baba. The chapter describes him as the 'complete Supreme Brahman' for whom the world is an illusion and who lacks 'consciousness of the body.' Because he is a 'mass of bliss' who does not know the birth of the body, the concept of death for his body is irrelevant. For such great souls who have conquered death and can 'place their feet on the head of Time,' physical death is described as being like 'dust before him,' merely a state of the body, not an end to their true, conscious self.