Yes the Doom gameplay was narrated. It was showing how the changes to the code affected the gameplay.

The main idea is to create narrated guides through the code. It can be audio only or mixed with video and images.

CodeMic basically records changes made to the code (as well as scroll, selections etc). It doesn't really care if the changes are made by the developer or the AI assistant. I think it would be the job of the narrator to explain why the files suddenly changed.

I'm excited to see what kind of content developers will create on CodeMic but personally, my inspiration is 3Blue1Brown. That is to say, not so much live recording of a 3 hour long programming session but instead shorter, more polished and well planned content. I suppose time will tell which will be more popular.