Obviously we don't have a complete record of everything Jesus said. But what Saint Augistine said here harmonizes easily into what Jesus was recorded to have said. As far as we know, Jesus said something very similar in Aramaic, but it was not considered remarkable or recorded since it is consistent with his teaching. As for the 11 examples in the article, they are contradictions of what was recorded, so its reasonable to assert Jesus did not say them.
I do believe when specifically necessary, God gives us the ability to or He loves through us as empty vessels greater than we could even consider because we see the sin so clearly. Hard to explain unless you have had Him reveal to you this kind of love.