https://wccftech.com/final-fantasy-xvi-trailer-actual-game/

The Final Fantasy XVI reveal featured footage from the actual game as the developer did not want to show a teaser that showed nothing from the actual game.

During today's Final Fantasy XIV Tokyo Game Show 2020 presentation, producer Naoki Yoshida talked about Final Fantasy XVI and its reveal trailer, saying that they wanted to show the actual game instead of something that was not representative of it. He also added that graphics are still being worked on, obviously, and that the next update on the game will come next month with the launch of a teaser website that will provide more information on the world and characters.