In a sane world I would have agreed but in the US at least I am not certain this is still true: In Bartz v. Anthropic, Judge Alsup expressed his views that the work of an LLM is equivalent to the one of a person, see around page 12 where he argues that human recalling things from memory and AI inference are effectively the same from a legal perspective
https://fingfx.thomsonreuters.com/gfx/legaldocs/jnvwbgqlzpw/...
To me this makes the clean-room distinction very hard to assert, what am I missing?