I wonder if Iger's words were specifically choosen. "Roy didn't talk much." It gives the impression that Roy wasn't an active participant while on the board. However, in the letter to George Mitchell posted on savedisney.com, item four is
"Release the series of letters and presentations written by Stanley Gold and Roy Disney to the Board and management over the last two years. The Company has questioned the accuracy of our statements without supporting its claims. We are prepared to openly discuss all of our statements."
And it's been obvious for at least 20 years that Stan is Roy's muscle, I wonder how much talking he did at the meeting. If Roy let Stan do all the talking and if much of their communication was written, Iger's statement (at least presented here, I don't know what his actual words were) would be 100% accurate, but the implication could be false.
But like you said, we'll never know