One of the images shows a scene similar to the Nintendo Switch 2 teaser video, where the Joy-Cons are used by pointing the magnetic connectors downward, presumably onto some kind of surface.
Another image shows how both controllers of the console are positioned while the user's fingers hold the control sticks.
In another image, both Joy-Cons are used differently, probably for additional controls. One of the controllers is pointed downward, as in the usual mouse mode, and the other is used vertically.
In total, the patent for the Nintendo Switch 2 controllers published in Japanese mentions the possibility of using the Joy-Con as a mouse more than 20 times. Although patents do not always translate into final products, some functionality of controllers as a computer mouse is probably to be expected.