This kind of math is nonsense, even as a back-of-the-napkin exercise. Engineers productivity is not linear, both over time and team size. In fact there may be

This kind of math is nonsense, even as a back-of-the-napkin exercise. Engineers productivity is not linear, both over time and team size. In fact there may be productivity improvements just be freezing hiring as adding too many people becomes net negative if the architecture and domain complexity does not support. Also, writing code is not the bottleneck on value, it's making the correct changes that adds value. While AI can accelerate simple and repetitive code production, this could easily add more technical debt and be net-negative producing over time if engineers aren't thinking about the big picture. On the other hand AI could add a lot of value not directly related to coding as it can process and "understand" more breadth of information (including code) that can magnify engineers productivity if used thoughtfully, but that may have no direct relationship to coding per se.