We seem to be talking past each other, but I'm not entirely sure where the misunderstanding is, so I'll just lay out my view of what the article says again in different terms.
A morality is subjective iff you have to look at the mind of an agent in order to determine whether they are moral. e.g., morality as preferences. A morality is objective iff you don't look at the mind of an agent in order to determine whether they are moral. For example, a single morality "written into the fabric of the universe," or a morality that says what is moral for an agent depends on where in the universe the agent happens to be (note that the former is not relative and the latter is, but I don't think we're disagreeing on what that means).
In both cases, the only type of thing being called moral is something with a mind (whatever "mind" means here). The difference is whether or not you have to look inside the mind to determine the morality of the agent.
So I'm not saying that mind dependent vs. indenpendent is the difference between having a mind and not having a mind, its the difference between looking at the mind that the agent is assumed to have and not looking at it.
If I understand you correctly this is my interpretation as well. But to clarify: there doesn't even have to be an agent in the judgment itself. Take the proposed judgment: "Black holes are immoral". This can either be subjective or objective. You are an objectivist if you look to something other than a mind to determine it's truth value. If you think the fact about whether or not black holes are immoral can be found by looking at the universe or examining black holes, you're an objectivist. If you ask "How do I feel about black holes", ...
Less Wrong is extremely intimidating to newcomers and as pointed out by Academian something that would help is a document in FAQ form intended for newcomers. Later we can decide how to best deliver that document to new Less Wrongers, but for now we can edit the existing (narrow) FAQ to make the site less scary and the standards more evident.
Go ahead and make bold edits to the FAQ wiki page or use this post to discuss possible FAQs and answers in agonizing detail.