I seriously doubt GM would release any ‘secret’ / market moving info without issuing a contextual RNS. I’d be happy to be proven wrong of course ;) but don’t think this will be the case. I expect the interview to be a standard one where he explains the strategy, outlook etc.
in my own, very personal stats, every time the motley fool talks about a share in a negative way, it goes up, and viceversa. I am personally treating this article as a buy signal :)