Only people who don't understand how this stuff works would have believed that the footage wasn't real. Then again, such talk was mainly born out of a cheeky tweet.
Regardless, I've tried to tell people what was coming, even in the remainder of this gen. I'll say it again - y'all ain't seen nothing yet.
I'm sure the vast majority of what we saw is genuine, but some of the finer details and perfect polish making it over would deeply impress me. Things like the way Ellie interacts with both sides of a counter while pulling an arrow out of a corpse simultaneously or the quality of facial animation in every moment of every npc are unprecedented.