Every instrument has been separated out and reconstructed by AI so technically it’s more of a “remaster” than most of the commercially released “remasters” of older music. Or the best we’re ever gonna get anyway. That other comment is just salty.
If you’re in doubt just listen to the new one and old one side by side - it’s not even close.
For the instruments I have a private plugin originally based on spleeter and I have LALAL.ai. Some tracks (like the drums) which it’s not as good for, I get my buddy to extract in FL studio (its implementation is surprisingly not terrible) since I use ableton. Sometimes the result is good, sometimes it’s not. There’s only so much you can pull out of these old tracks but the fact we can do it at all is pretty mind-blowing.