Of all the places to publish a talk that criticizes big walled garden platforms....
Granted this talk is not something he hosted, but generally speaking, Doctorow is the last one to make that argument with.
The guy is very good at outreach; the sad reality is that most people are on big walled garden platforms, so that's where you need to go to reach out. Him republishing his stuff to as many places as possible seems like the best of both worlds in that regard.
Ivory tower mentality is what gets us the FSF, and they have been awful at general outreach.