One of the reasons I crosspost things here (instead of just in the paleo echo chamber) is because I learn when things aren't coming across the way I intend them to, or when I need to correct them.
The article is very much aimed at someone who is trying to lose weight, and who is either sedentary or doing low-impact cardio as part of that effort -- something which has been proven over the years to be either ineffective or actively counterproductive. (i.e. "45 minutes on the elliptical, now I'm going to go get a smoothie!" which contains more calories than you burned.)
It is absolutely true that specific sports and activities require specific skills and strengths. I don't pretend to know everything that is involved in that, and I'm sure you know more than I do.
And though there is apparently a big overlap between 'paleo' and CrossFit (although possibly less now that they've cut Robb Wolf loose and cozied up to the Zone Diet), I have no experience with CrossFit. As such, I have no opinion on it, and am certainly not pushing it as a training method.
So it sounds like I need to add some clarification to that particular section: that I am speaking of weight loss and general fitness, not training for a specific sport or goal. If you want to run a marathon, of course you'll have to train steady-state cardio. (Though whether you should run marathons is another question.) And if you want to ski, play hockey, or sport climb, there will be specific training that can help you improve at those skills.
Thank you for your calm and reasoned response. It'll help me improve the article.