I don’t know. I stopped using DeepL sometime last year as I found its inability to be prompted about the purpose of the translation to be too limiting for my purposes. At that time, it also had problems with things like maintaining coherent pronoun reference over multiple paragraphs—problems not seen with LLMs. Perhaps DeepL has gotten better since. In any case, I’m sure they have a lot of smart developers and understand well the problems of translation, so I have no reason to think that I would be able to produce a better fully automated translation system than they have.