The article is obviously written to get a certain reaction probably for readership but a it's kind of obvious the author doesn't have much experience with CrossFit.
Dirty little secret? How can it be both a secret and have a clown where CrossFit openly talks about the risk (that the author openly acknowledges):http://library.crossfit.com/free/pdf/38_05_cf_rhabdo.pdf
Also - the article is devoid of facts but depends on conjecture and scaremongering (he notes the general risk but doesn't actually quantify how prevalent it is in CrossFit - and no one I know has gotten it, and none to my knowledge at my box). As others have noted, you can get it from any kind of exercise - but if you do a bit more reading of the condition, it's caused by doing too much too soon.
But if there's a reason to do/watch CrossFit?
"Don't miss the 2013 Reebok CrossFit Games on ESPN, starting October 2nd!"