Well… Yes pretty much. I don’t count Creation Club items because they weren’t made by Bethesda.
I don’t turn them on. As far as I know you can find free alternatives for most of what is in the creation club- you’re just paying for to support the independent creators, the convenience, and I suppose the service of Bethesda filtering out some of the worst chaff of the mod scene.
Similarly, I don’t count the other big fixes and upgrades in the Special Edition or Anniversary edition as DLC. Bethesda was rolling out patches for the original game before then, and visual upgrades are more in line with what I would call mods/remaster/remake than DLC.