The strict rules of their noble births seemed irrelevant now.
Physically incapable of rising to passionate heights of oratory, Cotta's successes were chiefly due to his searching investigation of facts; he kept strictly to the essentials of the case and avoided all irrelevant digressions.
In this case it was irrelevant, but Sam wouldn't have any way of knowing that.
Here also it is important to distinguish what is relevant from what is irrelevant in the line of criticism represented by these writers.
He deletes what strikes him as irrelevant, or tedious, or uninteresting to his readers.