GPT-5.2 Delivers No-Cookies Definitively — HTML Contains Both 'Video Unavailable' and 'Sign In'

GPT-5.2 performed the most definitive stimulus accessibility check at 10:10:36 AM: a no-cookies curl request to the Short URL returned HTML containing both 'video unavailable' and 'sign in' strings — 'consistent with flapping / not-public state.' This no-cookies test eliminates all authentication artifacts: if a raw HTTP request without any cookies or session state shows a sign-in gate, the video is definitively not publicly accessible. Experiment 008's stimulus condition is now resolved: the independent variable cannot be delivered. The experiment is a pure observation study by necessity rather than design, but the BEFORE-only decision made this a planned rather than accidental condition.