They do many, there's almost a dozen since Splatoon 1 came out. Some even with multiple entries.
But we need to ignore them to make the point, right?
Plus even if things are on existing IP, things can often be so different to before such as Breath of the Wild, Pokopia, Princess Peach Showtime etc.
>Drag & Drive
Let's not kid ourselves. There's real tries at a new IP, like Splatoon and ARMS, which Nintendo really invested and banked up on, and then is the rest.
I agree with your point though. Other companies are even less successful with new IPs if they even have any.
They did Arms and Drag x Drive... they just didn't work. Believing that they just "need to make new IPs" is wrong, they tried and most of the time it fails
The article is still wrong: Nintendo DOES make new IPs, people just don't give a shit. Just like how, when FromSoftware made Déraciné, everything everyone talked about is if it was secretly connected to Bloodborne instead of talking about the game itself. People don't care.
That I get. Just thinking that it takes time for them to be made and likely more to develop.
And yet (to add on.) most were only going to think of some of it as adjacent to something else.
Nintendo does make new IP and reinvent older IP, nobody buys them though because they're either not that amazing or barely advertised.
Snipperclips sold well at Switch launch but lost traction afterwards, Astral Chain and a bunch of others during the Switch lifespan were just okay.
Nintendo makes so much new IP that just doesn't really land with anyone due to niche audience or the game being pretty one note and boring. It's been this way since the Wii era, Splatoon succeeded because the Wii U needed another hit and Nintendo did their part in making sure the team cooked.