Ummm...no...don't think so. Its the opposite of tucking your butt in. Rotating your pelvis forward as suggested causes one to stick their butt out more and flattens the back for so called correct riding posture...the opposite of hump backed Lance for example.
OP...getting your glutes into your pedal stroke is the same as standing from a chair. You can't really get up without stucking out your bum.
Aside from being aero, this is why a road bike nominal position on the hoods is with a torso angle of about 45 degrees in profile.
To get your glutes in your stroke, you need to ride aero. You can't get power to the pedals riding upright because the stroke becomes pure quads.