Macca says "The Beatles" will release a final song that was a demo from the Let It Be sesions where they got a "pristine Lennon vocal" and some George work done too.
I recall Peter Jackson saying that they used a tool they developed to reduce the guitars plucking during a convo between George and John and some background noise in the canteen with the lads having a deep conversation.
Your opinion? Is really AI or is it just more sophisticated filtering/EQ/Compression tools not yet available to us mere mortals? I'm reminded of tools like Moises (albeit maybe more primitive based on Jackson's description) where you can extract vocal, drums, bas and "all other instruments" from a stereo recording.