There is a typo in the low speed formula. The reflected inertia of LG1 is currently listed as JLG1/(NS2/NL1)2. The correct formula should be JLG1/(NL1/NS2)2. In the high speed operation the reflected inertia of large gear 2 and small gear 1 is repeated twice. JLG2 + (JLG1/(NL1/NS2)2) should be eliminated from the first half of the equation.
These mistakes were caught by Neal Middleberg, who is the Chief Engineer of Bowe Bell and Howell, who uses this type of formula to help define total system inertia in complex machines.