Not true, if you have your right hand on the oponents shoulder slightly and punch with your left, you are paid for high contact.High contact is generally only paid in a marking contest when the players first intent is not the ball, or when their attempt at the ball is unrealistic. Which is outlined in the rules.
Just like when a player takes a specky and he clips the back of an opponents head it is not a free kick.
Intent to contest the ball overrides everything, particularly in a marking contest.