This guy takes ONE SHOT. A muzzle brake to control muzzle rise is NOT a concern to a single shot sniper.
My bet is that this guy is using a heavy bedded barrel competition bolt action with a good scope with good light gathering qualities. He would NOT be using one of those less accurate, dreaded -- shudder -- assault weapons designed for rapid fire.
As anyone who's been paying attention to the RKBA debate in this country can attest, the media has a definite agenda and they would be terribly upset if I'm right about this.