You might have misunderstood what I said. It’s not up for debate whether RMS’s opinions or intent on the GPL have affected industry practice; that’s a fact of history. His statements on the GPL are authoritative in the sense that they may have prevented the courts from examining this question.
What meaning are you thinking of, exactly? I looked up the definition and it matches what I intended to say in every dictionary I checked (Merriam Webster, Oxford, Cambridge, Dictionary.com…) Some of the definitions seem more or less synonymous with “influential”, maybe you’re making some incorrect assumptions?
