To be fair, he did provide scripture about how "everyone in that region" had been coming out to be baptized by John, so he simply said that it is highly possible that the thief had been one of those that had done that.
He went out of his way to say that it was only an assumption on his part, and that there was NO way that any of us would ever know. He stated that several times.
He never stated it as a fact, or even a likely fact, just that it was a possibility, based on that scripture.
Not trying to argue, just adding some clarification as to what was posted.