Did you forget to complete that log snippet as in my post, or were there no other entries? That log entry looks like what KMFrom described, so maybe you should attach the entire log file of the original log snippet.
Also, have you (or anyone else) actually witnessed said console text being broadcast in-game?
At this point, given the number of other administration tools you have installed (including third party SourceMod plugins), my recommendation would be to:
- Make sure that the person's steam ID isn't in any of your administration configuration files or your SQL admin database.
- Disable third-party plugins that implement generic administration features, such as SourceBans and SM Super Commands+Menu.
- Enable debug mode in plugin_settings.cfg
- See if the situation happens again.