I'm noticing terms related to DL/RL/NLP are being used more and more informally as AI takes over more of the cultural zeitgeist and people want to use the fancy new terms of the era, even if inaccurately. A friend told me he "trained and fine tuned a custom agent" for his work when what he meant was he modified a claude.md file.

Respectfully, your friend doesn't know what he is talking about and is saying things that just "feel right" (vibe talking??). Which might be exactly how technical terms lose their meaning so perhaps you're exactly right.