You are giving the already decoded message as input, it’s just short hand with one typo. It’s hilarious that you might think that for 80 years no one was able to figure out that BTTE was supposed to be BITTE

I wasn't thinking, just mechanically moving _what I though is the encrypted string_ into the LLMs context.

I did another proper run and gemini 3.8 flash in antigravity solved it in about 45min https://news.ycombinator.com/item?id=49805363.