OC is apparently a Reddit post explicitly stated by the author as being AI-generated.

Before finding that, the lack of an artist mark, tacked-on caption, missing colouring on the left woman’s skirt, and general face vibes were flags for me, but we’re at the point where even a pretty low-effort affair like this is good enough to make it ambiguous.

“Responsible disclosure” is a term of art, I think that’s why they use the word there.