The guy with the chip in his head talks about this exact thing in the podcast I linked. He said that they did not detach, they just shifted locations. For a little while, his brain mouse was less responsive, but after the update, it is now better than it ever was. He said a lot more, but I don’t remember everything. It was really interesting listening to him talk about it. It is nothing like how the article makes it sound. There are no little detached wires floating around inside his brain or anything.
I recommend listening to his interview, it is maybe halfway through the episode if you want to skip ahead. He is absolutely thrilled with the experience so far and said he was absolutely willing to go back in for surgery, but there was no need to.