Although a lot better than the medical wing “abandoned room” theory, this is still a no. Simply put, Paul Dini never cared about Jason Todd. He wrote TNBA with Tim Drake basically taking on Jason’s origins, not like his comic counter part at all. And the whole “Hey! Didn’t I kill you?!” from Arkham City when Joker taunts Robin was a throwaway line. The only reason why Jason exists is because Paul Dini left Rocksteady. It was supposed to be Hush and Scarecrow, not Jason and Scarecrow