Ask the CEO why you weren't consulted. There is no need to get confrontational and bring up all this other stuff. It will just distract and take focus away from

Ask the CEO why you weren't consulted. There is no need to get confrontational and bring up all this other stuff. It will just distract and take focus away from the answer to that question. You have to choose whether you want to play the "who is right" game or "how do we work together to reduce misunderstanding" game. It's the same choice you are making with the dev. Depending on what you choose outcomes are very different.