That link is a great read, but glosses over the initial issue and apology. What I had read (maybe in your other post) was a self promotion rule was broken, really a minor one if it was a first time thing, and when the artist apologized, or rather I think it was more questioning if what he did was promotion at all (which I think is what sparked the mod to wield their power). Such a little thing that should have stayed in DMs and been resolved simply, but power tripping is a strong drug.