“We see versions of Bruce that are in the conscious world and we see manifestations of Bruce that are, at times, not rooted in reality. People’s imaginations of Bruce take on their own form. Bruce is many things to many people,” Greg explained.

“A limitation of the show is we can’t have Batman,” the well-known showrunner continued. “So we try to turn that into a lot of possibilities of kind of exploring Bruce, and all the dimensions of Bruce.”

Source: https://www.distractify.com/p/does-batman-appear-in-titans