Yes, and that is a case where he's right in an obvious, academic way that is clear from the numbers to pretty much anyone who seriously works in the markets (ie: the kinds of people who made decisions about the macro trades that really set prices in the market).
But we're meant to believe that some doofus with an SQLI in some backend component is going to send GM tumbling?
I am, let's be clear, prepared to be wrong about this. But I'm happy to give clear voice to the opposing viewpoint on this hack-and-short meme.