Okay, actually watched the video in question that this was parodying, and I have to say... David Cage is actually right.
I mean, he leaves alot of room for people to make a strawman out of him, but he's right. The advantage of having technology is that you now have the power to, if you so choose, emulate emotion on a character's face without resorting to exaggeration. This is excellent for breaking down another wall in immersion. It wasn't stated, nor implied that better graphigz and moar poligonz equalz moar emotun, just that they give the developers more power to create it. It's well established that if you want to convey emotion, you need to give your audience a reason to have feelings for what you create, usually in that they can relate to it somehow. Cage never said that you can now skip that entire process of creating believable characters and employing drama into your work due to the better super graphics polygons emotion.
The focal point of that presentation, however, WAS the graphical capabilities of the PS4, and the argument was that graphics r gud, which is true, but they're not a necessity. It sounds to me like Cage was just excited that, hey, they got this new tool, and now, suddenly, they can start broadcasting in color versus black and white.
And yeah, developers will pervert it. But do you know what? I have a hunch that, among those list of developers that do so, going straight for moar polygonz (omg) and nothing else, Quantic Dream will not be on that list.