That's a load of rubbish in my opinion. I've been here 12+ years and I didn't notice anything like that as I was moving up the tiers.
Also, before September 2010 Master was the highest tier. When they introduced Tour Master and Legend did they make it so you had to be more precise with your putt, meaning you had to hit it more into the middle of the cup? And then what about when TL, C and TC tiers were introduced? If what you say is right, when they introduce more tiers the ball will never drop unless you hit it dead centre.
I have never seen a putt drop that shouldn't go in, at any tier, but at the same time I have seen putts drop in the side door for even the highest tier if the speed of the ball was right.