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Nintendo is reportedly considering outsourcing IP to more external studios | VGC
(www.videogameschronicle.com)
A community for everything Nintendo. Games, news, discussions, stories etc.
Game | Date
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Xenoblade Chronicles X: Definitive Edition | Mar 20 [Switch 2 Direct] | Apr 02 Metroid Prime 4 | 2025
As you can see, "Nintendo regularly works with third-party teams, including Bandai Namco, Team Ninja, Platinum Games, MercurySteam, WayForward and Grezzo.", it's just they are looking for more third parties.
Actually, if you actually look, you will be surprised how many big games are actually made by third party. Latest example, Metroid Dread, one of the most polished game was developed by Mercury System. Super Smash Bros. Ultimate is by Bandai Namco and so on.