Pangram skeptic says 500 human essays produced zero false alarms

John Holbein says Pangram labeled all 500 of his test essays as 100% human. He describes them as entirely human-written, originating before 2020 and not publicly posted. He’s ready to “eat some crow” about the detector, but adds that he hasn’t seen a high-quality systematic analysis of nonpublic documents mixing human and AI writing.