Correct me if I'm mistaken, but
Mobius treats all players as a Warrior of Light in an alternate reality/dimension, yes?
I ask because it's common in
mobage to have all players assume the same title and role in the story:
Mobius FF has the Warrior of Light,
F/Go has the Master of Chaldea,
FE Heroes has the Summoner of the Order of Heroes, etc. If that's true, then the dialogue is likely just meta-referencing how every player (Warrior of Light) has fought him, and how every player has their own problems they're dealing with. I wouldn't necessarily link it with the main franchise.
Kind of touching, though.
My mobage of choice isn't Mobius, but I do play FE Heroes. Add me to your friends list so I can force Julius to visit your tedious hovel!