101% chance Metallica did this

> Jacobs said the majority of the artists he recorded are pleased to have their work preserved. As for copyright concerns, he’s happy to remove recordings if requested, but added that only one or two musicians so far have asked that their material be taken down.

I think the keyword here is "preserved". These are old recordings that cannot realistically be recreated by any other method. AI may reconstruct some parts, but it's still not the real thing. These recordings are time capsules.