FWIW, I love Neil Young as an artist, he's one of my favorite musicians. I've just never found most of his albums to be that well recorded, for somebody who takes such a stand on sound quality. If he didn't take such a stand, I wouldn't even have called it out or noticed it really, as I think a lot of rock records from the '70s sound similar. Not all, but many. But I listen to them because I like the songs, and the lo-fi-ish nature of some of them fits the music.
An interesting comparison. I was listening to Big Star's 3rd this morning, on a vinyl pressing from the '80s. It just wasn't good. But I have the same songs, on a recent CD box set, and they sound fantastic. But wait! Thats...digital. The CD of the same recordings, remastered, sounds fantastic. The older vinyl pressing, doesn't. A newer vinyl pressing from 3 years ago sounds better but nowhere near as good as the CD- they really did a fantastic job on that box set.
Which is to say, I think Neil Young is a bit full of it. I get his intention, and I think its great- but there's so much more to what gets you good sound or mediocre sound, than whether or not its on vinyl, CD, or high res digital. We SHOULD have high res digital easily available by now. That still won't make all recordings instantly sound great. The highest resolution isn't going to save the recording from bad mastering or studio technique.
And bad mastering isn't limited to CDs. Don't believe the Loudness War hype. LPs are just as hit or miss.