After reviewing what everybody's said in this thread, I think I'm going to hope that the XCX team is doing the bulk of the work, that they are designing the next Zelda's map, and that this job posting is for the Kyoto team, who are supporting/polishing the work XCX team is doing.
I am also hoping that master map design is a latter segment of the development cycle - that Nintendo is fully past concept development, storywriting, engine development, asset creation, and maybe even dungeon design. Nothing really exists to tell me that they're at that point except that there's a reasonable bit of logic to say that map design could follow all that work - I just hope we're not seeing this job posting because we're at an early stage, because that would suck. If they've completed all/most of what I said above, it's plausible we could see the game as early as next year. If they're still at the beginning of the dev cycle with the game, as a whole, then we're almost certainly not seeing it until '22.
How about no? Now we need Xenoblade X Switch Edition and Xenoblade X2, take a team from a new studio in Tokyo and Kyoto studio as well. Monolith as of now have 4 studios total. Let the main team do their own project
Or we let the team that's proven itself work on the project that is worth the most. Why would Nintendo, or any Zelda fan, want a new, unproven team to do such important work on such a large project?
Xenoblade 2 is a newer release than BotW, anyways, so it's somewhat silly to hope for resources to be diverted for that ahead of Zelda. More likely is that Nintendo will have them design the map for Zelda, get it polished, then proceed to XCX2, and this will align with a release schedule that not only keeps the greatest number of fans happy, but also stresses their teams the least.
And it makes absolutely no sense whatsoever to put the main team on a Switch port of XCX. That's completely absurd.