Yeah. It basically shortens up the boss fight, and reduces/cuts some of the phases. I tried it on the Floral Fury one initially because I was feeling stuck and figured I’d give it a shot to see what it actually did.
Beating the bosses that way will open up progress so you can move on to other fights and circle back later, but my understanding is that you can’t face the final bosses until you beat all of the rest on regular.