While I think that is true and this thread here is about senior productivity switching to LLMs, I can say from my experience that our juniors absolutely crush it using LLMs. They have to do pretty demanding and advanced stuff from the start and they are using LLMs nonstop. Not sure how that translates into long term learning but it definitely increases their output and makes them competent-enough developers to contribute right away.
> Not sure how that translates into long term learning
I don't think that's a relevant metric. "learning" rate of humans versus LLMs. If you expect typical LLMs to grow from juniors to competent mids and maybe even seniors faster than typical human, then there is little point to learn to write code, but rather learn "software engineering with artificial code monkey". However, if that turns out to not be true, we have just broken the pipeline producing actual mids and seniors, who can actually oversee the LLMs.