The text says Sai Baba redeemed infinite beings in Delhi. How did he do that?

This appears to be a misunderstanding, as the provided excerpts from Chapter 36 do not mention Delhi. The text does state that Sai Baba, having 'attained Lord Vishnu (Chakrapani),' has 'redeemed infinite beings,' but this is presented as a general spiritual accomplishment rather than an event tied to a specific city. Chapter 36 describes his power in broad terms, explaining that he is the 'incarnation of the knowledge of Truth' and protects those who are devoted to him completely. The source material does not offer any details about redemptions occurring in Delhi.