I don't know whether that's what happened here or claim to know exactly what the constraints of IP law for this specific instance are, but "some stuff was changed" does not necessarily seem sufficient as a defense in general. Depending on the exact type of IP law that covers this there are questions like whether the changes were substantial enough to make it an original work or whether the way that the old stuff was used constitutes fair use.
Which goes to show there was never any original work to fallback to.
"See, if I remove the detailed descriptions - and the LLM regurgitated the rest - nothing will have been copied."
Some people really want to defend "build me a copy of thing because I don't like the license" to be acceptable behavior.