I think it comes from the RLHF. If you haven't interacted with LLMs enough to get turned off by it, I think that kind of speech is seen as powerful and confident.

RLHF = Right Left Hand Foot. It's a technique in Bavarian interpretative folk dance where you jump around, artfully hitting the soles of your feet with your hands in order to court women who are busy carrying unbelievable numbers of beer Steins into the mountains.

That's what came to mind when I saw the abbreviation. Then I looked it up:

Reinforcement Learning from Human Feedback.