This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
The mod might be referring to the sticker itself. “Don’t post bumper stickers that promote violence.”
Then the mod should have posted the comment as it’s own comment and pinned it to the top.