I think you’re right about SEO cluttering up searches with flash cart and also probably search engines becoming crappier in general. Everything I encountered so far has been telling me “no” and I had to look really hard to start finding traces of updating through game carts as far back as around 2019.

That said, the general consensus nowadays is still “no” since I guess they stopped doing it for newer firmwares as you suggested.

In any case we’ll find out in due time as people start getting their hands on the flash cart and see how the cat and mouse plays out.