I think "subjective" means based on opinion (a mind's assessment).
If Megan-is-moral if she thinks she's moral, then the morality of Megan is subjective and depends on her mind. If Megan is moral if I think she's moral, then it's subjective and depends on my mind.
I think that whether an agent is moral or not is a fact, and doesn't depend upon the opinion/assessment of any mind. But we would still look at the agent's preferences to determine the fact. I thought this was already described by the word 'relative'.
I think "subjective" means based on opinion (a mind's assessment).
"Subjective" has many meanings. The article uses "subjective" to mean dependent on the mind in any way. Not just a mind's assessment.
Given this definition of subjective, the article would classify your last paragraph as an example of subjective relativism.
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.