Because the files that uploaded by Universal Music Group itself are compressed in MP3, or at least in my opinion. It's not the same quality as vinyl and I bet they added noise reduction to all their remasters.
Are you serious? If so, it would be fascinating to be able to simulate the sound effect of Dolby type B or type S reductions in editing programs. That's what you mean, right? Or is Sketch Cassette just a basic audio editing program like Audacity or WavePad?
Honestly, the issue here is that I don't like remastered editions because I notice that they have lost a lot of quality than the original vinyl could have. Although I must say that some other remasters from other well-known libraries remaster it to very good quality.
But at the end, as long as the songs can be heard, that's what I'm happy with. But thanks to lessons I learned here on this site, it better be a lossy compressed file rather than a file that takes up too much space and also tries to look like it's lossless when it actually doesn't is.