Amazing work. Pity the article doesn't have details as the researcher and their team are still finishing the academic paper. Here's the researcher website (couldn't find social media to follow up about the paper):

- https://members.loria.fr/CPierrot/

Does anyone know if there is a Wikipedia page that collects documents that are pending translation or code-breaking like the letter in the article? I searched but the closest I found was a list of cryptography challenges.