No, you said, "you should have at least 300+ posts." That, IMO, means that you are implying that 300 posts is needed for getting JMOD (which it isn't). As long as his posts are helpful and meaningful, which they seem to be, he is fine for that area.
I get that people can change but I don't think 8 months is long enough to judge whether someone has learned not to post threats and links to porn sites in chat. This message will probably get deleted (like the last one did) but that's what I think. It's not something to be taken lightly.
Comments on Profile Post by Jaemzs