In retrospect, it seems so obvious now that ND had no idea how their engine would end up looking like in the end at that point yet, and were probably a bit too optmistic, while sony was pressuring them to show something to press as they had little stuff to show, and a damn console to launch. The whole diminishing returns was a big thing back then, and so was 1080p60... So they were bold, and burned themselves a bit. They showed what they had, which were targt renderers, probably indeed done in a proto-engine, maybe indeed running on ps4 hardware, or equivalent pc, but definetly not in real time at consistent 60fps (even considering its only one character, controlled camera and yada yada ) yet its mostly forgotten now, thanks to ND having a good product to show ( even if not at 60fps ) and thanks to the disapointment having been administered homeopatically. Still not very nice to falsely claim the reveal was real-time on ps4 when it most certainly wasn't.