I should maybe explain better. I don't mean it's on the same level in terms of quality and dopeness. I just mean that The Documentary feels like the last time that Dr. Dre locked in with a west coast artist and executive produced their album. And he was still working on Detox at that time, and was bringing in Just Blaze, Nottz, Hi-Tek, and Kanye West among others to contribute to Detox. And most of those guys showed up on Documentary.
So even though it's not Dre's album, and Dre's not rapping on there, there are some beats on there that were meant for Detox (like Higher and a couple others), and Dr. Dre felt like a presence on the album in a way that Dre hasn't felt like a presence on an album in along time, besides maybe Compton and Relapse.
Does that make any sense at all? I may still be way off.
I'm by no means saying that it's as good as The Chronic or 2001, or even that it has a similar sound. I just mean it feels like in terms of production that it might be the closest we came to hearing what Detox might have sounded like.