Technology

Yes, this is what I said. Situations where a work can conceivably considered co-authored by a human, those components get copyright. However, whether that activit constitutes contribution and how is demarcated across the work is a case by case basis. This doesn't mean any inpainting at all renders the whole work copyright protected--it means that it could in cases where it is so granular and directly corresponds to human decision making that it's effectively digital painting. This is probably a higher bar than most expect but, as is not atypical with copyright, is a largely case by case quantitative/adjudicated vibes-based determination.

The second situation you quoted is also standard and effectively stands for the fact that an ordered compilation of individually copyrighted works may itself have its own copyright in the work as a whole. This is not new and is common sense when you consider the way large creative media projects work.

Also worth mentioning that none of this obviates the requirement that registrations reasonably identify and describe the AI generated components of the work (presumably to effectively disclaim those portions). It will be interesting to see a defense raised that the holder failed to do so and so committed a fraud on the Copyright Office and thus lost their copyright in the work as a whole (a possible penalty for committing fraud on the Office).