Terrible title you selected for this thread. Sabermetrics explains Aaron Cook pretty well.
Aaron Cook also walks nobody (2 walks in those same 29.2)
Aaron Cook gets tons of groundballs, 58.8% this season
He's running a little lucky this year, his ERA is a career 4.50 and he's at 3.34 in small sample size this year. That is not disproving sabermetrics at all. He's not even an extreme outlier. There's more to saber than just K/9.