Comment by tonymet

even within the AI-paradigm, you could keep the juniors to validate and test the AI generated code. You still need some level of acceptance testing for the increased production. And the juniors could be producing automation engineering at or above the level of the product code they were producing prior to AI. A win win ( more production & more career growth)

In other words, none of these stories make any sense, even if you take the AI superpower at face value.