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Yeah it is, to an extent.
On my Niro, the foot pedal will operate regen braking to begin with, but will operate the disc caliper if more retardation is needed.
My observation was that I didn't put my foot on the pedal until the very end of my journey.
It definitely doesn't use the disc calipers (friction brake) unless I press the pedal, or if it invokes a safety stop, in response to a collision detection or fast deceleration in adaptive cruise control mode.
Is the foot brake not regenerative braking? My hybrid seems to indicate charging when I brake.