I don't think anyone is ignoring the fact that Nintendo licensed some of its IP to Ubisoft and Koei Tecmo for those games. But it doesn't change the fact that they were created, developed and published by third parties. Now, that being said, I'm arguing a real world definition. The "Switch Gamers Club" is your concept, and you are free to use a personal definition that is not in wide use if you so choose. Which is why I listed those games per your rules.
Nintendo obviously had creative input in all of those games. M+R and the like aren't like Rayman Legends with Mario and Luigi costumes for Rayman and Globox.
In the real world there will be no third party publisher who considers M+R and the like as third party games, i.e. any sort of indicator how well third party games sell on Switch.
You didn't answer whose game Project X-Zone is.