Shoe... the test was performed by Golf Digest, not Golfsmith. It doesn't matter whether you like Golfsmith or not, they just relayed the results of someone else's test.
Perhaps you might find a manufacturer's information, one that WGT is currently using, a little more credible. Currently posted at www.srixon.uk is basically the same thing.
http://www.srixon.co.uk/golf-balls/golf-ball-technology/golf-ball-durability/
If a manufacturer has determined that in real life the covers of their balls are normally scuffed enough to affect performance after X # of hits so it should be such in this game's representation of their products, fine. If WGT arbitrarily has decided how long a ball should last and it's not based on reality, fine. Just be honest about it.