Batman picks anniversary to go see Joker and fans think it’s about finding the Riddler….
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You're reading way too much from it.
There is one out for Batpsycho: the Riddler is systematically murdering people, so it was a time-sensitive issue and the anniversary was just an unfortunate coincidence...but when all's said and done the scene was too much and it's a good thing they cut it.
This. Whatever that anniversary is, it's a coincidence. The Joker has always been manipulative trying to make it seem his perspective is right and what he says is the fact. You can even see that on TDK (prison scene, about his scars, etc.) Anyway, as you remember from the film, Batman didn't have all the answers. He really didn't know who and where the Riddler was all that time. He didn't even know his grand plan. He got help along the way. Alfred working on the cypher, Penguin explaining what ratatouille really meant, the police officer pointing out the significance of the murder weapon which he missed since the beginning of the film. He came to Joker for answers or maybe even to get an idea how the Riddler works because he thought Joker and the Riddler shared the same thought process. Joker tries to twist it making it seem Batman was there for other reasons.