Yeah for someone who is the tech guy at IGN he seems to know very little about Dev Kits. Especially as the start of his posts was that Sony were not showing them on kit but PC's. If the games are running on a dev kit, technically thats perfectly acceptable.
It's very common to show games off on dev kits even when a console has launched. Mainly because most of the time when showing off games they are dev/release versions and not the actual game master (i.e the games are still in development). You don't normally make a master copy until you are going to submit the game for approval/duplication.
As for the heat issues - that's pure speculation and pointless to bring up especially as its totally normal to have games that are in dev being shown on dev kits..., he kept bringing it up when talking to Cerny.