The Valve Anti-Cheat is notorious for being poorly designed. There have been several instances when the anti-cheat has wrongfully caught a person afoul. When this happens to players at the top level, it is definitely a cause of concern for many. often times it requires direct communication with the game developer to lift the VAC bans. But its not as easy as said.
Australian team Chiefs’ CEO is definitely unhappy with Valve’s appraoch to the entire situation.