I don't doubt that's true CBL, but that's all about acceleration errors, that is where an acceleration changes the alignment of the apparent vertical. In the asymmetric flight case, we're wing down but with no acceleration. I don't see why you would get errors, or to be more precise, I don't see why you would get errors that you wouldn't get in wings-level flight.
I was hoping that JT might come up with an interesting mechanism...
