If you had been set to write an Obi show and had gone back and refreshed yourself on the canon - scenes and dialogue made in both PT and OT - would you have written Obi as unaware?
I mean, I definitely would. When the realization that he didn’t actually kill the brother he loved happened offscreen from the movies, writing that as its own story is a no brainer. It’s extremely fertile ground for emotional character work, I don’t see why any writer would reject that opportunity. Regardless of how you think it was done, the concept is more than sound.