I'm thinking it will release by Q1 2023 at the latest. R&D phase for a new console usually lasts like 3-4 years at the most, and Nvidia/Nintendo may have already been working on this for months or even a year before this job listing.
Or, they may be starting development right now. We have no idea. It is also possible that this has nothing to do with Nintendo at all. There are always rumors of new entrants to the console business.