It's outsold every home console currently available and also all the consoles from the previous generation, which is pretty surprising for something which "ceded the traditional home console" and which, when not in a handheld configuration, looks and plays very much like a traditional console.

On the handheld question, Valve hasn't released numbers, but a Nov 2023 quote put Steam Deck sales at "multiple millions", so probably at the lower end of between 1 and 10. By contrast the Switch has sold 132 million units. That's somewhere between 1 and 2 orders of magnitude difference. It doesn't make much sense to make comparisons between them. I'm sure piracy of Nintendo games is far more common on PCs and laptops.

Nintendo has been "dying" for decades -- just like Apple.