They could've written text in Mandarin and used an LLM (or any other translation tool) to translate it to English, which wouldn't have introduced the LLM writing style.
They didn't, so the reason isn't that English isn't their first language, it's that they didn't want to spend time writing text. In which case I don't understand how this is different from a native English speaker doing the same thing.
They didn't, so the reason isn't that English isn't their first language, it's that they didn't want to spend time writing text. In which case I don't understand how this is different from a native English speaker doing the same thing.