Battlelog of player in question.
I've noticed him making some incredible shots during this round but after checking his profile I presumed that to have been luck.
His stats aren't exactly what you would expect from someone who's using an aimbot.
Then again, how could someone who performed this bad before suddenly get so good seemingly overnight?
I went to spectate him anyways just to make sure. And voila, my suspicion wasn't unfounded after all:
Especially from 01:50 onwards it becomes very clear that he's using third party programs to enhance his aim.