There's a lot of both negativity and positivity here. I think both are warranted and important. I'm not generally a fan of Musk and think most of his ventures are overhyped. I also understand that Neuralink committed a series of horrific acts against macaques to develop this device and they ought to be investigated and have what they did shown to the public for scrutiny.
That said, as someone who has undergone screening for a neurodegenerative disease (thankfully I tested negative), I'm fairly confident in saying that it's an awful thing to experience and any technology that can provide more autonomy is invaluable. When I had to confront the possibility that I might have MS or ALS, I literally said "Neuralink probably shouldn't have killed those monkeys but, fuck it, they're already dead so they better hurry up. I don't want to live like that."
I hope we can develop further treatments more ethically and in a way that doesn't result in dystopian brain adverts of course, but even this level of technology is miraculous.