Just bear in mind that the rear wheels are driven so that is part of the rotating mass.* The front wheels (assuming your are RWD) would be more likened to unsprung weight although both apply to all 4 wheels.
Rotating mass (and the intertia it takes to accelerate it) is most applicable to flywheels, drive shafts, bob weight/crank mass but also ( though somewhat less so) * the wheels and tires. Also all driven loads (behind the motor) are effected by gear reductions and driveline slippage.
Check me but it's either 3:1 or 4:1 for rotating mass but it may be much more for crank mass, but in practical terms I believe his formulas assume a mechanical (clutch) drive so slippage losses through a conventional fluid converter will IMO reduce the true Net benefit.
With an automatic your engine essentially turns a fluid pump which in turn drives the car's wheels; people don't seem to like to think of it that way, but essentially that's what it is
BTW, Just about any experienced engine builder can tell whether the motor was in a Manual or automatic just by the way it comes apart. Automatics (since they're not direct driven) absorb a lot of the drivetrain shock loads by the time they get back to the crank hub
