While the bull is fake, the Carmelite practices recommended in it are longstanding and worthy.
Yes, fasting and praying is good. Yes, Mary prays for the faithfully departed every day and on Saturday. We can count on that.
While the article you quote mentions early release (a poorly chosen phrase) nothing in the teaching of the Church refers to early release...because...there ain't early, late or right on time in Purgatory.
This is a hard teaching. Who can accept it?
I'll have to admit imagining the Communion of Saints all staring at their watches waiting for the second hand to tick to Saturday so that the souls in Purgatory might finally cross the finish line is hilarious.