Does Chapter 30 suggest that Sai Baba's grace is only for certain types of people, like learned Brahmins?

No, Chapter 30 makes it clear that Sai Baba's grace is not exclusive. While it does mention that learned Brahmins come from great pilgrimage places to remember His feet, perform Gayatri recitation, and read sacred texts, it immediately contrasts this with a statement of humility. The text says, "We are devoid of proper samskaras and of little power... Even if everyone abandons us, Sai does not forsake us." This highlights a key teaching from Chapter 30: Sai's compassion extends to everyone, including those who feel they lack proper spiritual training or power, assuring them that He will never abandon them.