Higher quality than CD is a pretty dubious claim. CD quality is so good, the industry had nothing better to throw into the market. As video went from VHS, to DVD, to Blu-ray, CD simply couldn't be topped.
https://www.33rdsquare.com/do-cds-sound-better-than-spotify-yes-cds-still-provide-superior-fidelity/
That's not related to quality though. Perfectly possible to have 7.1 audio sound like a tin can. Surround CDs exist, just not common.
I was talking about visual quality for video media as compared to audio quality for CD medium.