That’s pretty much it, yeah. I think that when they had a thread that was basically a Q&A for Brigitte, Goodman said that his predicted comp had Brigitte filling the off-tank role.
Found the quote so here it is. For context, this is in response to someone asking if she will be played as a support more or as an off-tank more:
So it sounds to me like they planned on her enabling triple support comps, but still leaving room for DPS to shine since she’d essentially be replacing the spot where Zarya would usually be. I don’t think anyone could have known that GOATS would be meta. I’m not even sure if the GOATS team thought their comp could become meta.