Nintendo will never make anything like this.
... You... really think the Switch 2 is gonna be capable of 4k, super high poly counts, super hi def textures?
A PS5 can barely pull off 4k at 30 FPS with similar graphics. The video maker is running/rendering this on a PC with a 3080ti, 64 gigs ram, i7 10700k.
Further, Nintendo will sue the pants off of anyone who attempted to remake one of their own games, yes, even if it was totally free.
Anyway, this is a trailer not for a game, but for a 15 to 20 minute short film made in UE5, of which about half of the run time is Link running around a very unpolished demo world in 3rd person, with zero gameplay, the other half being pre rendered cut scenes.
The parts that 'look' like third person 'gameplay' could very well also be pre rendered.
Not really sure how the author of the article is unaware of all this, took me 10 minutes to figure out by looking at the YT channel.
Yes, the videos are neat hobbyist showcases.
No, they are nowhere near playable games.
If you took one of this person's 3rd person segments and attempted to export it and run it on a PC approximating Switch, you might get 20 fps at 720p.