Sorry, I can't do anything as he wasn't in our servers, so I don't have any connection sequences to pair him with. Also, more importantly, the GUID in the screenshot is invalid.
Our server protects against fake GUID spam, using PunkBuster's pb_sv_GuidRelax variable. So really, that specific GUID (and for that matter, any GUID that doesn't conform to hexadecimal format) can't access our servers.