Stallman can give a talk about "how to invent free software and build a movement around it" because Stallman has invented free software and built a movement around it. For Stallman, there is a significant overlap between "what it's like to be me" and "how to invent free software" - his version of that story is exactly the story nobody else can tell.
It's not about telling a better story. It's about telling a story better.
It's not about telling a better story. It's about telling a story better.