The example in the screenshot doesn't match the question.
In this example, the username "arthur" has been flagged to the Stop Forum Spam database 22 times.
However, arthur is a very common and plausible name so there's no guarantee this isn't a false positive. The name somewhat matches the email so in this example, I'd wager that it could be a genuine user.
If you see email: blacklisted
then Stop Forum Spam has essentially completely blacklisted the email as it has a very high probability of being a known spammer.