Yes, I see that Alexander VI had planned some reforms but it appears that his papal successors didn’t follow through with his plan. I don’t know if banning indulgences was one of the reforms, it isn’t on the list that I saw.
Alexander VI was a Borgia Pope and his immediate successor wasn’t a fan, although some later Popes didn’t share Julius II’s low view. Wikipedia has this:
Following the death of Alexander VI, Julius II said on the day of his election:
“I will not live in the same rooms as the Borgias lived. He desecrated the Holy Church as none before. He usurped the papal power by the devil’s aid, and I forbid under the pain of excommunication anyone to speak or think of Borgia again. His name and memory must be forgotten. It must be crossed out of every document and memorial. His reign must be obliterated. All paintings made of the Borgias or for them must be covered over with black crepe. All the tombs of the Borgias must be opened and their bodies sent back to where they belong – to Spain.”
The Borgias’ apartments remained sealed until the 19th century.
Oh, sure. The infamous Borgia Pope was going to reform the church? He’d have had to start by removing himself!