I am not sure what "not playing detective" means. There are some posts that are clearly spam although they don't have a link and do make "sense". But they don't add anything to the conversation, are very vague, pull up old threads, there's just clearly not a person with an interest in the conversation behind. That happens especially in the hobby/advice part of the forum.
I think that's what KB meant; there are posts were it's just so obvious that it's spam, we don't need to play detective.