As I understand it, the blown diffuser doose not work by keeping the engine "running" but the drivetrain "disconnected". If this were the case we would hear engines at high rpm throughout braking.
What actually happens is the throttle is kept at 100% (say) throughout braking but without fuel and/or ignition. This turns the engine into a big air pump, providing further airflow to the diffuser.
Regarding KERS, given the low power limit allowed by the FIA, the systems fully recharge almost instantaneously. The teams don't need to recharge it by continuing to run the engine, nor would it give them any extra power. Further, continuing to burn fuel would be a massive disadvantage given the lack of refueling.
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