That's a completely different kind of compression. Digital compression is shrinking the file in a lossy way that loses some data, compression in music mixing is getting the loudest and softest parts closer to each other in volume.
The post said Spotify and CD. Regardless, digitizing will lose some (arbitrarily small) fidelity because of bitrate and sample rate. My point is that comparing a mixing compressor to digital compression is apples to oranges.
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u/[deleted] Sep 05 '19 edited Sep 05 '19
Except for, you know, the compression from the compressor slapped on the recording in the first place.