Interesting they are presuming a smash factor of 1.46, while the PGA Tour average is 1.50.
Using the FlightScope Trajectory Optimizer, under the current spec (176mph, 10*, 2520rpm) the carry/roll would be 285.8/295.1 . At a 1.5 smash factor, 180 ball speed, the carry would be 293.3/302.6. To reach 317 yards under the current spec FlightScope would expect a ball speed of 188.4, or a smash factor of 1.57.
Under the new spec (183mph, 11*, 2220rpm) the carry/roll would be 302.1/311.4. To reach 317 yards, FlightScope would expect a ball speed of 186.3, or a smash factor of 1.49.