DA will trade anyone for the right offer, but it has been widely reported by reputable sources, the Philly offer never happened. This looks like a smokescreen and Stein's source is probably the same source as the Philly trade rumor.
Maybe DA is trying to drum up interest in Smart or maybe a rival GM is trying to sweat DA. No one knows except the involved parties, but what I know is that DA has been doing all of the right things in the rebuilding (IMHO) and I trust his judgement.