I’m using code in the sense of the word pass codes. Like, encryption codes. The codes you input to an encryption algorithm, along with the cyphertext, to get the plaintext.

But yes, Nintendo and you are saying that distributing Yuzu is illegal because it can only be used to violate the DMCA.

I disagree.

It can also be used in compliance with the DMCA, and nothing it includes are the intellectual property of Nintendo. There are exceptions to the rule about circumventing copy protection, and as long as you use Yuzu with an intent (such as security research) that falls in one of these exceptions, you can use Yuzu legally.

As long as Yuzu is never distributed by its authors with the encryption codes, it shouldn’t be illegal, even according to the DMCA. Otherwise, there would be no way to circumvent copy protection for legal purposes with regard to Switch games.