Gotham Knights: Jim Gordon's Death is More Mysterious Than Batman's

Because Gotham Knights operates under its own original narrative umbrella, it is uncertain what events and lore from Batman's franchise mythology have already unfolded by the time of the game's story. It is evident that Bruce Wayne has been Batman for an extensive period in Gotham Knights due to the established Bat Family, but other key details are only assumed or speculative.

Source: Gamerant