Nintendo would deny ANY and ALL circumvention, no matter how “illegal” it is (which it isn’t, if you’d read the article). Nintendo profits off the deaths of their previous hardware, so of course they will say things are illegal which aren’t. I mean they did abuse the DMCA just a few months back against various legal projects.
It's way more than just profits, look at all the loved games from their past that they continue to not release on digital storefronts or "Nintendo Plus" or whatever they call it now.
Nintendo has an ideological position that essentially the first sale doctrine is wrong and they have privilege over you for things you legally purchased.
https://gbatemp.net/threads/nintendo-reportedly-issues-dmca-...