Isn't that more correlation than causation, though? The kind of person who's not keeping up with the current new tech hotness isn't going to be looking at AI or modern frameworks; and conversely the kind of person who's dabbling with AI is also likely to be looking at other leading-edge tech stuff in their field. That seems to me more likely to be the cause of what you're seeing than that the act of using AI/LLMs itself resulting in candidates improving their knowledge and framework awareness.