I hope this isn't true. It sounds dumb.>Mob boss who ostensibly wants to get away with his crimes specifically hires a hitman whose entire thing is leaving clues>It's a howcatchem instead of a whodunnit, so we already know who the villain is and have to wait around as Batman figures out that "The Riddler is Edward Nygma!", something we've all known for 70 years now>It's a "every villain has to be as deadly and edgy as The Joker in order to be a compelling villain, so we'll interpret The Riddler as the Jigsaw Killer instead of making him unique in Batman's rogues gallery by making him more motivated by outwitting others and showing his superiority than the same base violence of every other villain" episode.
Fuck that. It doesn't have to be a 1:1 adaptation of The Long Halloween, but I'd still like something that features Batman tracking down some serial killer who isn't an established character so that his identity is an actual mystery to be solved, while the presence of the killer complicates a parallel conflict Batman has with Gotham's criminal element, including whatever recognizable villains you want to use so that it's not just "Batman vs. Literally Who" and we still get some villain fanservice. It's a formula adaptable enough that you could do something that is inspired by TLH, but isn't a direct translation. That way, even comics fans won't know how it ends and spoil it for everyone else.