A lot of players on the server including me think they´re using wallhack

Thank you for recording and posting a demo.  It's something we encourage guests and members alike to do rather than just accusing and harass players.  However, there is nothing in demo that suggests a wallhack.  Maybe a few wallbangs that you're unfamiliar with.  They're firing based on sound, uav and widely used places of travel.

[Better to be Judged by Twelve Than to be Carried by Six]

Some of those kills did look mighty fishy to me. There were some Wh's that were not high traffic areas. His WB always proved a target so it didnt seen so random. This the reason i am not a fan of WB'ers. I can do it, but choose not to unless I have seen or heard them before they duck behind for cover.