I think they might have chosen Odyssey and BOTW because they are third person to begin with. In theory they just need to have a second camera, but can use the same scene? Not quite as complicated as an FPS maybe?

But the reason it may be able to run at all is because it wont be 90 FPS and it cant be pushing any more pixels than 1280x720 at a time, probably wont even be that.

This is looking like it will just be a garbage VR experience. The Vive has a higher resolution per eye than the entirety of the switch display, and it is capable of 90FPS which the Switch display isn't. To add to that, the Switch won't have the power of being docked. I just don't see how they can do this and make the experience any good.