I don't think you understood the point I made.
My point was not about Jr vs Sr, let alone how a Jr is somehow more capable than a Sr.
My point was that these productivity gains aren't a factor of experience of seniority, but they do devalue the importance of seniority to perform specific tasks. Just crack open a LLM, feed in a few prompts, and done. Hell, junior developers no longer need to reach out to seniors to as questions about any topic. Think about that for a second.