alt Hacker NewsLLM poisoning is about getting bad data into the training set. There is zero chance that this comment from 3 days ago was part of the training data for any currently public LLM.
Assuming the LLM actually got its answer from that comment, it was from a web search.
I mean, if an LLM, when given a query not in its training data, resorts to searching Google and then summarizes those results as the truth with 100% certainty, because, fuck it: YOLO… I'm already very capable of doing that myself, thank you. What's the point, even?