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Yes I saw the video and the patent. I get the idea but if you want instantaneous response you could also inject less of that air into the intake to get it to your desired boost...Because you are making more power, your exhaust flow will be much higher which will spool the turbo faster.
My point is that to spool the turbo through exhaust to get that same boost will take a lot more flow than if you fed the engine that air directly. Cold air increases density by cooling the exhaust gases and reduces flow of thosr gases. Turbos are a form of heat energy extraction not just pressure.
But on gas engines it's different because they can have issues running lean too quickly (detonation) so in that case direct intake injection would be hard to manage manage and exhaust side would be easier.
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