This whole “Horse riding an astronaut” was a bit dumb in the first place, because AFAIK CLIP (the text encoder used in first-generation diffusion models) doesn't really distinguish the two in the first place. (So fundamentally that Marcus guy was right, the tech employed was fundamentally unable to do what he asked of to do)

> The irony is it is the human, not the generator, that got confused about the purposefully out of sample horse riding an astronaut prompt, and changed it to astronaut riding a horse.

You're mixing things up: "astronaut ridding a horse" was used by OpenAI their Dall-E 2 announcement blog post, ”horse ridding an astronaut" only came after, and had a much more niche audience anyway, so it's absolutely not an instance of “humans got caught by an out of sample instance and misremembered”.