What, no disclaimer that you are actually the creator of coffeescript?? Your comment seems a bit biased to me. But I'd expect nothing less from a coffeescripter.
So you think it's better for someone who has no experience coding to have to understand why they would write some code one way, then have to "transpile" to something else to get it to run? Then if something goes wrong they have to figure out how to fix it in two languages? This doesn't sound like something I would recommend for a beginner, or someone experienced for that matter.
No, he specifically said at the start that he doesn't recommend it to Khan Academy.
To me, it reads as if he is simply supporting John Resig's decisions about what parts of JavaScript to teach -- by virtue of having made those same decisions in designing CoffeeScript.
So you think it's better for someone who has no experience coding to have to understand why they would write some code one way, then have to "transpile" to something else to get it to run? Then if something goes wrong they have to figure out how to fix it in two languages? This doesn't sound like something I would recommend for a beginner, or someone experienced for that matter.