Because it turns out in the world of the DC Rebirth, that Batgirl was actually Oracle at some point, again. The wheelchair-using, archive searching, googled up remote operative that give the rest of the Birds Of Prey and te Batfamily an advantage in the field.
And it’s more like The Boy Who Collected Batgirl.
But the real question – will DC Comics fanboys accept a male character in the role? Clearly a plot by these meninist SJWs…