That he should be regarded as a suitor to herself would have seemed to her a ridiculous irrelevance.
"However," he went on, accenting the word, as if to dismiss all irrelevance, "what I came here to talk about was a little affair of my young scapegrace, Fred’s."
Nothing could have seemed more irrelevant to Dorothea than insistence on her youth and sex when she was moved to show her human fellowship.
It was only the common trick of desire—which avails itself of any irrelevant scepticism, finding larger room for itself in all uncertainty about effects, in every obscurity that looks like the absence of law.
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.