My own opinion is that "power split" is an incorrect term. It's more like a "torque split" device since it splits torque between the wheels and the generator. How much power is "split" depends entirely on the speed of each part, whereas torque is always 50:50. At a stop 0% of the power is going to the wheels and 100% (minus losses) is going to the generator.
Again, my own opinion.
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