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Yes, imagine it's a book cipher and then you hand it to a tool which famously has had every book in existence cleaved apart and fed into it.

The number of permutations you can try to decode a book cipher is near infinite. Just "a book cipher" does not tell you how the numbers map to words or characters in each book.

You just try creating random book ciphers and see whether an LLM would solve them without hints.

Apparently neither found it worth pursuing, and just phoned it in.

> “…leider gerade keine zeit das nachzuschauen.“

And it's not like it was a load of detail either, it's a comment on a blog 16 years ago.

You don't get points for throwing out a possibility for the type of cipher, you get points for solving it.