I doubt that most people think that’s what “coder” means today. They just use it as a shorter word for “programmer.” Leslie Lamport seems to see coding as translating a (perhaps implicit) specification into code. We understand that writing is primarily thinking (or researching, etc.), not typing. So it is for people who write code rather than prose. Do people really not understand this?
Every second of the day, we are either encoding or decoding both internal and external information. It's the foundational system as to how we operate and react to stimuli.