I mean I just took it as something that Taylor knows how to do, which is fun only can happen in dc comics moments, here it’s Batman beats up a ghost. It’s not really part of the main plot in any way with the white bat-terrorists, it’s just a cool fight that Batman even gets to make a slight joke of with Knight later in the hospital.
Probably the only reason it was explained so that people wouldn’t instead complain of how can Batman beat up a ghost.