I suspect that what they mean re the electrically assisted bit may be as follows, approximately..
When the engine speed/rpm is not commensurate with a sudden demand for more power, so the turbo would not normally spool up well, spooling would be assisted using an electric motor. I would guess this to be integrated into the generator mounted on the main turbo shaft, it being a sort of two way input/output device.
I remember once at the shelsley Walsh hillclimb in worcestershire there was a car ("shelsley special" - a complete one off with no bodywork) there that used a helicopter starter motor to keep the turbo spinning. Mad idea but seeing it in action was pretty cool. The intention was to use it as a crude form of anti-lag. For the most part it worked well.
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