This looks about comparable to the remaster from earlier, which looked incredible for a Switch game. The trailer looked nice but definitely not what we would expect from something on the level of a PS4. I don't see a reason to doubt that the footage was the game running on Switch.
But the fact that people are debating if this is Switch 2 footage speaks volumes about Retro Studio's skill. Jaw-dropping graphics for a Switch game.
This is crazy. The first time we've heard a peep out of Starfy since The Legendary Starfy outside of Smash. And this is the first time these three games were ever released outside of Japan! It makes me wonder if Starfy's about to make a comeback, but that's probably just wishful thinking.
Wish they were translated, though. These games have stories, and while you don't need that to enjoy the level design, a part of the experience is gonna be lost on anyone who can't read Japanese.