I know, what i asked was a follow up question to this, "how did the 2015 E3 gameplay footage compared to the final game?".
The 2014 teaser was clearly a cutscene by the way. We saw that with how the camera was moving (gameplay wouldnt have camera work like that). But i could see why people thought this would be in game fidelity too based on the real-time comment. I thought so myself.
Thanks for the tip about the DF video. Seems like the E3 2015 stuff that was shown is quite representative to the final product. This is good at least because people who dont read forums and such are much more likely to have seen this footage, and the later footage is always more relevant than the old stuff. So even if they lied in 2014, at least the 2015 footage is representative.
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Here is what Naughty Dog said regarding the slides that were posted earlier:
"The most valuable lesson we learned was - Shipping a game was way different than making a real-time demo.Gameplay and having smooth framerates are always the number one priority. There are so many things in our game could slow down the frame rates, such as crowds, particles, complex environments, etc.
We had to cut down the cost of characters constantly, instead of mainly focusing on pretty images. There were so many times we almost lost hope about whether we were able to ship something decent with such strict limitations.Fortunately, we have a great team with all kind of creative ideas and always there to help each other. Its a great honor to be part of the team, and its a great learning experiences to work on this challenging project."