Error growing into a lie.
It was an error a few days ago, but now that the author has been shown how the Catechism disagrees with his characterization of Catholic teaching, the absence of a retraction makes it a lie -- a culpable and intended untruth.
The first sentence may well be true. Who can argue with the last sentence? Not me. The apodosis of the second sentence, may be true with respect to some other aspect of our teaching, including our teaching on Baptism. In fact I bet it is.
But the protasis is not true. It says that we teach something we do not teach. It is easy to find out that we do not teach that. It took me less than 5 minutes.
When someone errs, that's no big deal. When someone errs and denies it in the face of incontrovertible evidence, that's serious. It breaks a commandment.
If somebody says, "I am here in the name of the Truth," and then not only says but persists in saying something manifestly untrue the kindest thing you can say is that his behavior is ludicrous.
Flying skillets!