Yeah. Did some digging, apparently the user stated that "n and c are no comment" [1]. From context its not clear whether they don't want to comment, or if the characters literally stand for "no comment". But to me it seems the former: it appears it's not necessarily about the author, but what the art depicts. C seems to be children.

[1] https://www.reddit.com/r/StableDiffusion/comments/xl8bj2/aut...