Perhaps that was a marketing effort.

After all, everyone likes to tell the tale of the forbidden topic and the apprentice being insulted. You are spreading the story around now - increasing the mystery and intrigue of these mythical events about which (almost!) all records have been deleted. The material was left in public for a long time - creating plenty of opportunities for it to "accidentally" leak out.

By allowing partly obfuscated forbidden materials to emerge, you may be contributing to the community folklaw, spreading and perpetuating the intrigue.