I've heard Baba's teachings are profound, but did the scriptures describe him giving complex philosophical lectures? What was his actual method of instruction for his devotees?

According to the source material, Maharaj's approach was primarily ethical rather than overtly philosophical. Chapter 0 explains that he did not openly lecture on profound Vedanta subjects or give discourses on the Upanishads. His method was to first purify the disciple's 'ground' with general ethical principles before sowing the 'seed of knowledge.' He held three sittings a day where he would give advice through stories, often addressing the specific inner thoughts of those present. The text emphasizes that the most significant benefit came to devotees through direct experience and faith, which was considered more valuable than verbal advice alone.