Not the definition I would have used,
although, it may just be CHEAPER to refine oil into gasoline etc. in Canada and Mexico and import the gasoline.

But then why would CNN title an article
"Behind high gas prices: The refinery crunch" ?

I didn’t get the idea from CNN. Probably from some righty contributor on a FOXNews show like Hannity (and Colmes.)
and that is probably where I got the idea to blame lefties.