Not all 55 gram shafts will lack stability. I happen to have 3 54 gram driver shafts, with torque ratings of 2.4*, which is very low, even for a good 75 grams shaft. So let's not say ALL too quickly.
As for the test, I looked at the distance the testers are hitting their irons in their profiles, and most all of them are very short hitters. Some only get 145 yards with their 5 irons, which is 5 yards less than I normally hit my 9 iron. Hard for me to have much faith in the test results when all the testers are that short. And as has been mentioned, the magazine does take AD money.