There is a real drive on social media to prove that it is Terry not Tim but so far there is zero evidence to support this. Some are citing DC Fan cites and a book called the Essential Batman Encyclopedia which has a small excerpt where the writer called that character Terry. I doubt he actually read the comic though. Also there have been claims of Tim being an error but there I have not seen this anywhere and how does a toy get made if it is an error? I wonder if reprints changed the name to Terry? The story supports it being a world conjured by the Joker. At the time, in DC comics, Tim Drake was Robin. Maybe Loeb is an insufficiently_thoughtful_person and got confused or maybe he is a genius and threw Tim in there as a joke. I suspect the former to be true. And finally, the Earth is not named so we don't even know it is Earth-12. I would like to know if it was an error but it doesn't appear to be the case. And finally, Batman Beyond appeared 5 years earlier in two books, One Million 80 Page Giant and World's Funnest.