Hacking , also  he was using the hack to spam the chat 

https://cdn.discordapp.com/attachments/463497278640881666/475119987317538818/Screenshot_67.png

https://bf4db.com/player/789368716/snapshot/14523

http://battlelog.battlefield.com/bf4/battlereport/show/1/1026579044736840192/789368716/

http://battlelog.battlefield.com/bf4/battlereport/show/1/1026294550809290816/789368716/

http://battlelog.battlefield.com/bf4/battlereport/show/1/1026283842587600960/789368716/