@Gargron
In the actual literature, pre-machine translation, it was well-established that translation amounts to authorship, with the clear example of poetry -- translating poetry into a new language is absolutely an act of authorship, not a mechanical act.

It may be somewhat less true of other kinds of works, but now we're talking about degree, not of kind.

Admittedly LLM translation is pretty handy sometimes when there's no other translation alternative, but we must be prepared for it to fail utterly at times -- like other uses of LLMs.