I clipped the relevant section:
View: https://streamable.com/dcd4sr
Nintendo showed a suite of competitive and cooperative multiplayer minigames for Bellabel Park, but then teased additional content that will be detailed in the future.
To this end, we see what appears to be content playable in single player (and no doubt multiplayer, as well, but they clearly made a point to show Mario wandering around the map by himself).
We see all seven Koopalings in their Clown Car. We see Captain…
Author: invalid@example.com (Neiteio)