Piz is being both diplomatic and kind.
There is a random deviation that can and sometimes will affect EVERY shot to some degree. It can add or subtract distance, and it can go left or right. It has an uncanny knack of kicking in when there's real trouble about (water, nightmare pot bunkers etc), or at least that's when you'll notice it the most lol.
But sometimes it kicks in at the right times. Like miss a shot left - swear - look up and with astonished surprise see it sailing beautifully. I tend to forget these and only remember when I ding the shot - chuckle - look up and with bewidered disgust watch it sail about 10 degree's offline straight into the crap.