wow, that was one very weak article. No real information given other than he was out for 11 seconds.
I feel for Josh and hope he gets tested to rule out any long-term effects. Fortunately, it is unlikely he will have any. I don't know the particulars of his injury, but the vast majority of mild, uncomplicated head injuries such as this resolved completely from a neuropsychological standpoint within about a month. Yes, it's scary, but he will likely be fine from a cognitive standpoint.
As for the article, fairly fluff piece with little accurate information regarding concussions.