From the fangraphs piece:
"Projection systems are not perfect models, and as the White Sox have shown, there are important variables that are not being measured as well as they could be."
I'm not someone who believes that the PECOTA people are somehow biased against the Sox, I just think that a system like this is not suited to predict whole team outcomes. Even if they started taking into consideration the White Sox, frankly, unbelievable training staff, there are always going to be other variables that pop up that can't all be accounted for.
And on the 8th day, God created churros.