DeepL has always used machine learning, and they already switched to LLMs for some language pairs – not rebranded ChatGPT, but their own stuff. They’re also quite open about the model not being perfect, they’re advertising with things like “blind tests show our results sound more natural than the competition”, “our model output needs fewer edits than the competition”, etc.

And yeah they definitely didn’t edit this one much from the English original. English sentence structure and American idiomatics all over the place, it’s tedious to read. Quite, but not entirely, as bad as this.