I think that when he says that Babs was mangled, he meant AS ORACLE. My takeaway was the Babs was mishandled here in comparison to her characterizations both in 'Birds of Prey' and as recently as 'Blackest Night', where we have Babs saying she's just happy with the life she's built, thanks for asking. The Babs here is ANGRY, while the Babs there was RESOLUTE.
It's impressive to look back at the crippling of Babs and how it went from being such a big negative to such a big positive in the ensuing 20 years. Instead of killing the character, it feels that in most ways, it allowed her to step out of Bats' shadow and become a fully-realized and strong character.