LLMs can learn, just not the same way that juniors do. When an LLM does something wrong you can always update it's rules or skills to not make that mistake again. Or you can utilize a subagent whose sole purpose is to review code to prevent that mistake. Lots of ways you can improve LLMs over time.
Of course if you don't provide that feedback loop, no learning happens. I guess the same could be said of a junior, though.
