When the show had Jerome pull the cut his face off thing, they went too far
This retcon was necessary to have the same actor continue to portray the Joker with a fresh body and face
There is enough backwards weird science/magic/logic that will make him go back to a fresh faced Joker again to face Batman in the future
The Joker shouldn't already have had a cut up face before even meeting Batman as Batman
I mean, if that was the case, they could've used an asspull with the Lazarus Pit/Water to restore his face instead of a convoluted plot regarding a previously unknown twin.
I believe the only reason they went with the twin angle is because they had already claimed too many times that Jerome would not be the Joker. After the character became popular, they knew they just couldn't backtrack on their previous claims, so they went with the twin brother instead.
It's a dumb solution, to be honest. Jerome was already the Joker in everything but name.
The new Joker design looks SUPERB, though, and I'm willing to give "Jeremiah" a chance to become the Clown Prince of Crime. But still, Jerome and Bruce already had a history together. It's so dumb that they are just going to scrap all that.