Thread:Tupka217/@comment-26127492-20190627035407/@comment-26127492-20190710222356

Sorry for the late reply. But yeah, Joker is set outside the main DC Universe. All of the characters are reimagined from the ground up, including changes to their characterisations. Penguin is now a mob figure named Abner instead of Oswald Cobblepot, Riddler is a computer hacker who uses his question mark cane because he's crippled, Harley Quinn is a stripper in the Joker's organisation, ETC.

There also haven't been any references to it in the main universe.