Natural language is very lossy: forming a thought and conveying that through speech or text is often an exercise in frustration. So where does "we form thoughts at 1,000-3,000 words per minute" come from?
The author clearly had a point about the efficiency of thought vs. natural language, but his thought was lost in a layer of translation. Probably because thoughts don't map cleanly onto words: I may lack some prerequisite knowledge to graph what the author is saying here, which pokes at the core of the issue: language is imperfect, so the statement "we form thoughts at 1,000-3,000 words per minute" makes no sense to me.
Meta-joking aside, is "we form thoughts at 1,000-3,000 words per minute" an established fact? It's oddly specific.