What's the dynamic range of vinyl? Usually 70 dB, whereas 16bit PCM is around 90 dB. That's what OP was probably referring to. Since the master was done for the CD then compressed for the vinyl it sounds softer/cleaner.
CDs do have superior dynamic range, but when modern mastering squashes everything within a few dB of full scale it hardly matters. But I disagree that vinyl releases[0] typically have lower dynamic range than CD releases (most often it's the same, sometimes it's higher, and only very rarely it's lower), and I disagree that lower dynamic range sounds better on good equipment.
[0] Talking about popular music only. I don't know enough about classical to say how it's done there.
I have no actual data about the musical signals present on the discs themselves (be they made of any kind of plastic with grooves or pits), I just mentioned the technological limitations of them. ( see also https://wiki.hydrogenaud.io/index.php?title=Myths_(Vinyl)#My... )
However, as far as I know the loudness wars is coming to an end finally: https://en.wikipedia.org/wiki/Loudness_war#2010s "Analysis suggests that the loudness trend may have peaked around 2005 and subsequently reduced, with a pronounced increase in overall and minimum album DR (crest factor) for albums since 2005."
