You don't.
Currently, there is enough of an anti-AI sentiment here that people will call out what they believe to be AI generated content, and most of the time commenters will preface such comments, and they will get voted down. Such comments are becoming more and more common, however.
But plenty of HN users are pro-AI, or work for AI companies or have AI startups, and of course this forum is run by the company formerly owned by Sam Altman. I strongly suspect (but can't prove) that there are already AI driven accounts here, and that people are posting AI comments without bothering to mention it. And that the trend will grow in that direction over time as AI becomes normalized within the tech industry and society at large.