He is using Aimbot hack.

https://gyazo.com/352e5dba20f6f12c87b8e9df0256d6b2 

Please look at KDR,KPM,ACC

If he normally played

KDR is 1 or less, KPM is 1 or less, ACC is one digit

Please compare

The numerical value of the game that used Ainbot was abnormally high

Normal play (15 hours ago)

KDR 0.59, KPM 0.70, ACC 7%

http://battlelog.battlefield.com/bf4/ja/battlereport/show/1/932966407493418112/1871161483/

But Use cheat  play

KDR 2.6, KPM 3.4, ACC 22%

http://battlelog.battlefield.com/bf4/ja/battlereport/show/1/932869512707929856/1871161483/

The difference is clear when using Aimbot and when not using it