Yes, in my opinion astroturfing and vote manipulation go and in hand. For me it’s not just an admin perspective, I Think users having this kind of info can be beneficial. Admins’ (or mods’) interests aren’t always aligned with users’ interests, as reddit has taught me.
And when a source isn’t clear, they mark the post as #doubtful.
It is where I get my music too. They even have tons of Vinyl or SACD rips, among other hi-res formats, if you’re into that.