... it being even this efficient is due to the generator being integrated inside the AC motor all built into a unitized stack so control and switching losses are much lower than an alternator. Nissan epower is the closest to a true direct interaction electric field differential transmission (ECVT) as it isn’t spread out into separate motor and generator sections on a planetary
I don't know where you got this idea, but it's not true. The e-Power system has a separate generator (with controller) and motor (with inverter), just like every other series hybrid. They're all mounted together in one case, along with the differential and the gears to connect everything, but the power flow is completely conventional: engine drives generator (via helical parallel gears), generator output is rectified and regulated by controller, battery accepts excess power or provides additional power, inverter converts to AC, motor drives differential which drives axles.
While it would be interesting to build a machine with coaxial rotors for mechanical input and output, interacting magnetically and controlled electrically, this doesn't exist... or at least it certainly does not exist in a Nissan.
Nissan's e-Power is functionally identical and physically configured similarly to Mitsubishi's Outlander PHEV and Honda's Accord Hybrid, except that the Mitsubishi and Honda systems include a clutch to mechanically bypass the generator-motor system for better efficiency when speeds and loads are suitable. The Mitsubishi also has a rear electric drive unit for AWD (and 4-wheel regenerative braking), but e-Power has that available now, too.