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It is not a simple substitution using the polybius square with pairs of letters from ADFGVX mapping to 25 letters of the alphabet.

The first step is to take each letter and turn it into a pair of letters from ADFGVX but the second step is then a keyed columnar transposition.

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"The model used “TRUPPENVERSCHIEBUNG” as the encryption word, as described on pgs. 214-215 of J. Rives Childs's “The History and Principles of German Military Ciphers, 1914–1918”"

Even if it isn't a simple substitution cipher as you said, all the model did was try a decryption key that had already been found and was publicly accessible. This is basically a nothingburger.

Oh yes, certainly, I am not blown away by what was done here. The AI had access to the cipher type and a list of keys.

Ah, thanks, seems that's in the second part, but not very well explained.

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