Isn't this a bit of a "straw musk"? I haven't seen it claimed by Musk or anyone competent/high up at Spacex or their fan communities that Mars could be terraformed in a "ridiculously short" time, i.e. < 30 or so years.
Perhaps we should be more precise about what counts as "ridiculously short", quantify the disagreement, etc.
Epic work, it's always fascinates me when author explores the topic so deep, that doesn't know where to begin, so finally starts with the whole history of the universe or the existence of human race.
http://waitbutwhy.com/2015/08/how-and-why-spacex-will-colonize-mars.html