Can’t see what witness’s literacy has to do with the case, irrelevant’n’immaterial.
"Now let’s consider this calmly-" began Atticus, but Mr. Gilmer interrupted with an objection: he was not irrelevant or immaterial, but Atticus was browbeating the witness.
Slowly but surely I began to see the pattern of Atticus’s questions: from questions that Mr. Gilmer did not deem sufficiently irrelevant or immaterial to object to, Atticus was quietly building up before the jury a picture of the Ewells’ home life.
There are no more uses of "irrelevant" in the book.
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The sentence should be deleted because it introduces information that is irrelevant to the passage.
The writer should deleted the sentence because it provides background information that is irrelevant to the paragraph.