No, you’re off on that one. An indulgence only eliminates the residuals of sin that are taken care of in purgatory according to the Catholic Church. If you are there, you are going to end up in heaven anyway. It’s a common misconception. In other words, even when there was a selling of indulgences, it wouldn’t move you to heaven from hell, just shorten your stay in purgatory.
Strange that the Book Rome assembled so long ago never mentions this.