FWIW, they're claiming the whole system (motor operating at optimal state point + IVT gearbox) is more efficient than the usual whole system (motor operating fa

FWIW, they're claiming the whole system (motor operating at optimal state point + IVT gearbox) is more efficient than the usual whole system (motor operating far from optimal state point due to size and weight constraints + fixed ratio gearbox). Which is not immediately implausible.