Whether in EV mode or HV mode, you will notice on the power/charge gauge that Clarity tries to recoup the loss from deceleration into battery charge. And there seems to be no difference whether the deceleration is caused explicitly by braking or implicitly by paddle regen. A feature of the paddles is that they allow different degrees of deceleration. And also support "one pedal driving".
In my opinion, allowing stronger decelerations is a more consistent feature of SPORT than of ECON, and is not as supportive of energy efficiency, as The Gadgeteer has eluded to. Nonetheless, I think it is a great feature for those coming to the Clarity for the first time, who will be thinking: What kind of Volt is this!?