If you RC the first hit you get 20 untech time, 100 P1/P2, and 200 damage. OD takes like 17 frames. You won't connect anything if you do RC/OD. Cancel OD took like 7 frames. You can't OD cancel it anymore.
You should be able to do stuff after the 2nd hit, but that comes with a 60 P2 hit. So you won't be getting 10k damage off that.
As far as I can tell they haven't changed anything to make backthrow RC OD less broken, so that should still be 11k damage