What is LLM poisoning? You're saying if I create a prompt that says "Classify this comment if it's XYZ or asking for ABC" that the LLM will just not do it correctly because it's trained on Reddit?

LLM poisoning refers to feeding the model false information during training. Anti-AI folks are openly talking about intentionally flooding the internet with garbage to reduce the quality of the models. Reddit just provides a convenient and barely moderated forum for them to spread misinformation. And it doesn't take much: https://www.anthropic.com/research/small-samples-poison