What is the irony in Progress Report 5?

This entry is written on March 6 as well. The author uses the tool or vehicle of conversation to reveal information about characters' plans or motivations. He also stays true to Charlie’s mental abilities, and has the protagonist deliver the scientific conversation piecemeal. The vocabulary that Charlie does not know is purposely omitted with just enough evidence for readers to understand what words they stand in for: “A tremen*** achev***” (8).