I think you mean where he says: Can indulgences be Scriptural, since there is no need for anything but Jesus’ blood to remove all punishment and guilt due to sin? The question assumes that indulgences operate under a power other than Christ’s. So the premise is false. According to that website’s logic, there would be no need for sanctification after one makes the initial assent of faith. But Scripture is constantly speaking of the need to mature in faith, to be chastised for the sake of holiness, etc… That website’s author is also ignorant that Christ takes away the eternal consequences of sin. If He took away all consequences, then why is the world still fallen and marred and Christians still suffer and even still sin themselves?—this is all a result of the Fall, i.e. a consequence of sin.