It doesn't seem clear to me at all. e.g. I've been having a fun time learning Godot this last week with codex laying down groundwork for logic, generating assets, etc. This gives me something concrete that I can work with and ground myself within instead of starting from a blank canvas. I don't much care for the actual scripting logic because it's all basically trivial to me with a few decades of programming experience, and I'm not going to be able to develop my artistic abilities to a useful capacity anytime within the next few years, so I can instead focus on learning architecture/organization patterns and game systems that I'm interested in while I read through docs.

So basically, if you use it to wave away things you've mastered or explicitly don't want to learn at the moment, you can stay focused on things you are figuring out. I don't see it as any different from writing "by induction" in a math proof without writing all the details because you and the reader know you could easily work them out. In this way I can learn things that I simply would not have the time to dig into before, increasing my skillset. As is was before AI, metacognition is the most widely useful skill to have.