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This kind of setup likely doesn't generate much power, for that you need to split the shaft so the compressor can be stopped.
The issue with traditional turbos is that you need to add restriction to the turbine to deliver enough shaft power for response and low rpm boost. Adding an electric motor on the shaft lets you use electrical power to spin the compressor up when there's not enough exhaust going through the turbine.
To harvest energy efficiently, the turbine needs to be spinning pretty quickly to serve as an efficient impulse turbine, but having a compressor attached that also has to spin quickly is counterproductive. In F1 this isn't a problem since the engines run full throttle but on a street car running at part load, spinning the compressor is a waste of energy.
It's much more of a throttle response upgrade than anything else.
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