Except that there are many data points. Here's another: https://twitter.com/DashMeister1/status/1607568958382825474
And OpenAI has described some aspects of how these filters are trained -- https://unherd.com/thepost/chatgpts-score-system-shows-polit... -- and it sounds like a bunch of humans are involved in rating which responses are "kosher" and not, and that "kosherness" filter seems to have a pretty clear left-leaning bias.