I can't speak on this specific example

but the jist of the digital files is that they compress the sound

and actual clip some of the frequencies

to save file size

the example in my paper I think was an Elton John record

some of the sounds in the original release

got clipped out when it was re-released in digital format

so you actually got a song with some of the pieces missing

I would guess, Bad being released in 87', pre-digital dominance

might suffer from the same conversion sacrifice