"Inspection equipment development engineer" is the smokiest one of these I think I've seen. Though, as with "Marketing Director", they could just need to replace someone etc.
One of my partners is in HR. Jobs being posted together doesn't mean that they go together, but jobs that go together - part of the same overall project, reporting to the same manager - tend to post together. These three jobs being posted together heavily imply a new console -
not necessarily a new Switch. These same requirements would be if Nintendo were building, say, a N64-mini, though the
Electronic Circuit Designer is suggestive as hell that it's not
Electronic circuit designer: Specifically looking for someone with 5 years expierience with "Wireless communication including high frequency circuit antenna" who has "knowledge about wired / wireless communication between devices based on various standards and within devices." This is not just for prototypes, they want someone who can design ASICs. Seems like work on a wireless controller primarily, but it's definitely for console-like hardware, they need experience with analog circuitry like "power supply, audio, various sensors, display devices, etc." This could just be for a new kind of controller for the existing Switch, which Nintendo has made many of, certainly.
Hardware development project manager: This is someone to oversee the build of a "mass-produced product" starting with "leading and executing hardware prototypes." Again, this could be game and watches, or a retro Game Cube controller
Inspection equipment development engineer: This is for someone specifically to build hardware and software to do automated QA on a new console. Note that it's building a device "for game console input / output devices, for checking the operation of finished game consoles, checking the operation of accessories for game consoles." Assuming this translation is accurate (and it might not be!) "finished game consoles" implies this is an assembly line toolset, not a toolset for, say, repair shops to inspect damaged hardware.
Collectively this says "nintendo is making a new console" but console could be a very fuzzy term, including bespoke minis and handhelds. But whatever it is, it's past the core chip design, and into the tooling that turns finalized internals into a complete console