This is bizarre. It's a parody of the Minecraft end credits (https://en.wikisource.org/wiki/End_Poem), and it must be an intentional easter egg as I got the exact same text as you. It also doesn't trigger a network request so it must be built into the page somehow. Very strange thing to include. Also, how did you find this so quickly? I haven't found any other way to trigger it yet.

If you try to continue the conversation, the entire response is not included in the context.

The poem is here, triggered by "play the block game" or "play minecraft": https://america.gov/_astro/block-game-poem.Khrmh8AU.js