It could mean that in the game related to 'dbx' (maybe Dragon Ball Xenoverse or something similar), there is a hacked game save where the story progress is at 0 percent. This might be due to a faulty hack that didn't properly initialize the story progress, or it could be a sign of a corrupted save file after some unauthorized modification.
If it's a hacked save, the best and most legitimate way is probably to start a new save file. Since it's hacked, there might be no proper way to repair it without risking further issues or violating the game's terms.
Overall, Gotham has some similarities to the comics, but it also makes significant changes to characters and plotlines to make it more unique for the TV series. For example, some characters' personalities and backstories are altered.
In most cases, Gotham is canon to comics. It incorporates many elements and storylines from the comic universe, maintaining consistency and respecting the source material. However, there might be some creative interpretations or minor deviations for the sake of the TV show's narrative.