To put and end to it, there's next to nothing ninty can do to block or stop systems with a9lh and a firm partition protection cfw (luma, saltfw, shadownand).
Ninty needed a downgrade free ofw for the Sun/Moon bundle. They got it, it's 11.0. Yeah, you can still go hardmod on that but great part of the people won't do it. In the meantime, blocking downgrades also blocked new installations of a9lh or emunand on those ofw 11.0 systems. They are still vulnerable to flashcards. As they know they would. But that's about it.
Below 11.0, it's still pirate land. Specially below 10.5. There's nothing to do against ye olde emunand users nor the new a9lh collective. There's nothing to add to 11.0 as it's stable enough. And please remember, for ninty 3ds is a decaying platform and has replacement being planned right now.