The dude in the demo is using upside down aimbot, but unless we know for sure that the person in the gg demo is the same as the steam id you got from the wcs server we can't know for sure.
If you can provide the wcs demo we can ban him that way.

Is there anyone who knows how to get a steam id from a demo if it didnt show in chat to make sure its the same guy?
Also, I already checked psychostats and the dude wasn't in game long enough to have been recorded.