Call Allah Instead Of Khuda
Any book is written with an audience in mind. Al-Bayan is obviously written in Urdu for those familiar with that language. I’d be hard pressed to find a person who speaks and understands Urdu but doesn’t know what the word khuda refers to. Even if you can find such a person, as long as he has a reasonable level of intellect he’ll figure out the meaning in a few seconds through context. If there’s still any room left for error, it will be undoubtedly filled by reading the content of the book which discusses the oneness of God on every page if not more often.