It is because of the cache, as someone probably summarized the page very early on.
Current summary straight from the API:
"Universal Summarizer is a tool developed by Kagi that is able to quickly and accurately summarize articles, videos, and other texts. It is able to pick out unique and interesting details from the text, such as the fact that a character in a book has a prosthetic arm, or that a certain card is legal in Legacy but not in Modern or Historic. It is also able to provide summaries of complex texts, such as Herman Melville's Moby Dick, and even provide summaries of technical documentation. It is also able to summarize texts in different languages, such as Spanish. The tool is also able to provide summaries of videos, and is able to provide summaries of texts that are difficult to summarize, such as the allegories and humor in the Tao of Programming. It is an impressive tool that is sure to be a great asset to the Kagi search engine, and could be used to improve the results and UI of the main search product."
Current summary straight from the API:
"Universal Summarizer is a tool developed by Kagi that is able to quickly and accurately summarize articles, videos, and other texts. It is able to pick out unique and interesting details from the text, such as the fact that a character in a book has a prosthetic arm, or that a certain card is legal in Legacy but not in Modern or Historic. It is also able to provide summaries of complex texts, such as Herman Melville's Moby Dick, and even provide summaries of technical documentation. It is also able to summarize texts in different languages, such as Spanish. The tool is also able to provide summaries of videos, and is able to provide summaries of texts that are difficult to summarize, such as the allegories and humor in the Tao of Programming. It is an impressive tool that is sure to be a great asset to the Kagi search engine, and could be used to improve the results and UI of the main search product."