>>shiroi+(OP)
It's too late for that to be a realistic defense. The Mazda legal team already has a target that they can go after for any further developments with the source code. This post acknowledges that he received the cease and desist letter. The issue isn't just whether you win in court, it's also how much of your time and money is wasted fighting a corporate legal operation. Arguably, a random person publishing the source code would create additional problems for him.
An effective defense has to protect your time and money. One such defense is to never let your real identity be plucked from obscurity and fixated on by a legal team.