Thumpalumpacus
Major
Sadly, I don't think they survived the last meatgrinder.
I've read that the Ukrainians have penetrated the first lines down south, and that the supporting lines are poorly manned. ISW assesses that Russia has resorted to lateral reinforcements, which implies few or no reserves in the rear to bring up.
So I think it remains to be seen -- but they seem to have not been defeated, contrary to what you've written.