Isn't Neuralink (and other brain interfaces, I assume) also based on the idea that you can pinpoint which neurons are responsible for each function in the brain

Isn't Neuralink (and other brain interfaces, I assume) also based on the idea that you can pinpoint which neurons are responsible for each function in the brain? If I've read the article correctly, it seems to suggest that they're a moving target. How can permanent implants interface with a moving target? Might the entire Neuralink concept be based on a flawed assumption?