Think about it. Modern turntables of today come with tighter bearing tolerances. Much heavier platters. Vacuum suction. Air bearings. Magnetic bearings. High torque motors etc etc. Yet all fail at that test. Take a look at the measurements of all the last uber decks including Airforce Zero, Oma K3 and SAT in stereophile. Constant speed deviations of 0.25% / 0.30% / 0.35%.
I would bet your 927 is going to show you a deviation of 1/10th of those numbers. My humble TD 124 shows me 0.04%. Timing is everything!