“Why do you assume he doesn’t know that?”
Because he obviously would have phrased things differently if he realized that he would be able to give his message over more effectively that way.
He had a message he is trying to get across as he wrote in his last post. If he thought/knew there is a better way to get it across, he obviously would have done so.
The belief is that he is giving over the message he wants to give very effectively, unfortunately.