I went back in their comment history before LLMs existed and found comments where they claim to be a doctor and sound like they know what they are taking about. I’m not a doctor but my wife and many of our friends are, so I know what they sound like.
But as far as trust goes, Hacker News has historically been a fairly high trust community. LLMs have the potential to change this dynamic, but I don’t think encouraging people to assume that every post is an LLM is helpful. I don’t think a community with that level of distrust is possible, and at that point we should just all walk away.