If you saw that on their blog, then they must have changed their blog post because the word “detached” doesn’t appear in the link tou shared, or in any of the blog posts on their website.
It would be understandable if they changed it, though, to clarify, because when people hear “detached,” they are thinking that part of the device is free-floating in his brain, but that’s not what happened. It is just that the electrodes on the device became lined up with slightly different neurons, but they were still receiving signals and were still attached to the central hub of the device.