content: Basically true, but the firmware all exists outside the human brain.  So it'll be easy to turn off.  For the most parts methods of changing peoples opinions or minds using this technology will be restricted to variations on how it's done right now.  Without deep-brain implants they can't 'get into your head' on a visceral level.  Neuralink does not support deep-brain implants.  All they can do is feed you information they want you to see.  So basically what facebook and twitter do now, but faster.  So the same sort of sanitization of information is all you can meaningfully expect for the foreseeable future.