Sounds to me like a good justification for the death penalty. Follow due process, but if the SOB is hardened to his crime, then kill him. Which goes back to a point of the article. The Inquisition introduced due process, and a high level of dueprocess into the prosecution of heretics. Of course, you can't admit that heresy could be a crime. This is a bit like liberals who could never admit that being a communist could be a crime. But I won't push the matter. In any case, the argument is made in the article that a person accused of heresy was more likley to receive what we would call a fair ttrial than a person accused of, say, theft. I think that is the chief claim of the article, that the Inquisition provided for a fair trial, at least in theory and often also in fact. A lawyer's trick: man accused of stealing a pig claims that his religious beliefs allowed him to do it. A matter of heresy. The case is taken over by the Church court. He adjures his heresy and gets off with a penance. This is the practical side of an ecclessiastical court being more lenient than a secular court. For this reason everyone one who could read and write claimed clerical status.
The article was written by a professional apologist. What else do you expect from him?